Questions on Algebra: Equations answered by real tutors!

Tutors Answer Your Questions about Equations (FREE)

Question 69814: I never seem to be able to set up equations from story problems. I think I have an idea about how to do it, then am usually disappointed. If I see an example, I can usually apply it to similar problems, but I rarely remember how they work for long.
Example:
The launch site for Trigon Balloon Co. is 250ft. above sea level. A hot-air balloon is launched from the site and begins to rise at a rate of 110ft/min. At the same time, another balloon, 2220 ft. above sea level begins to descend at a rate of 150 ft/min.
How long will it be until the balloons are at the same elevation?
What will their elevation be then?
I set it up this way, but it doesn't work out
250 + 110x = 2220 - 150x
Click here to see answer by ankor@dixie-net.com(22740)

Question 69824: Are the following lines parallel, perpendicular, or neither?
L1 with equation x � 4y = 12
L2 with equation 4x + y = 4
(A) Perpendicular
(B) Neither
(C) Parallel

Click here to see answer by tutorcecilia(2152)

Question 69887: Solve:
(x + 2)^2 = 7
My answers are:
a) 2 plus minus sqrt7
b) plus minus 47
c) -2 plus minus sqrt7
d) plus minus sqrt 47
I do not understand how they end up with roots? Thank you for the help on this one!
Click here to see answer by ptaylor(2198)

Question 69891: Solve by completing the square:
x^2 - 16x + 63 = 0
I have four answers:
a) -7, 9
b) 7,9
C) 7, -9
D) -7, -9
When I plug in these answers, I do not come up with zero, am I doing something wrong? Thank you for your help!
Click here to see answer by ptaylor(2198)

Question 69893: Solve: (x-5)^2 = 7
Do I use the foil method on this? Thank you!
Click here to see answer by tutorcecilia(2152)

Question 69823: Write the equation of the line which has y-intercept (0, 5) and is perpendicular to the line with equation y = �3x + 1.
(A) y = � x + 5
(B) y = 3x + 5
(C) y = �3x + 5
(D) y = x + 5

Click here to see answer by ankor@dixie-net.com(22740)

Question 69880: Solve using the quadratic formula:
5x^2 + x = 3
I have four choices:
a) -1 plus minus sqrt16
------------------
5
b) -1 plus minus sqrt61
--------------------
5
c) -1 plus minus sqrt 16
---------------------
10
d) -1 plus minus sqrt 61
-------------------
10
Can anyone help me get the concept of the quadratic formula? Thank you very much!
Click here to see answer by bucky(2189)

Question 69903: I am having trouble with this extra credit word problem. Please help.
If three-eighths of a number is 72, what is one-fourth of the number
Click here to see answer by jim_thompson5910(35256)

Question 69885: Is the following trinomial a perfect square:
x^2 - 6x + 9
I do not understand what method I am to use to figure this out, can anyone help me out please? Thank you
Click here to see answer by jim_thompson5910(35256)

Question 69914: write an equation that requires the use of the addition property of equality, where 6 must be added to each side to solve the equation, and the solution is a negative number. the book say's x-6= -8..please explain the process.
Click here to see answer by ankor@dixie-net.com(22740)

Question 69954: what does the y stand for in this equation
3y+6=13
Click here to see answer by checkley75(3666)

Question 69953: 2x+x=180
solve for x
Click here to see answer by checkley75(3666)

Question 69946: If x - 10 = 35, which property of equality for real numbers justifies that x = 45. show the use of this property
Click here to see answer by ptaylor(2198)

Question 69948: 13/12 x + 1/12 x = 9x+ 1/6 + 11/12 How do I work this problem to obtain the right answer ?13 is at the top and 12 is on bottom as 1 over 2 and 1 over 6 and 11 over 12. Thanks for your help and how to work the problem.
Click here to see answer by ankor@dixie-net.com(22740)

Question 69982: Find the slope and y-intercept.
x = �7
is it:
(A) Slope: undefined; y-intercept: (0, �7)
(B) Slope: 0; y-intercept: none
(C) Slope: undefined; y-intercept: none
(D) Slope: 0; y-intercept: (0, �7)

Click here to see answer by Edwin McCravy(20054)

Question 69978: This is an extra credit problem I'm having trouble with.
A boy on being asked the age of himself and his sister replied: three years ago I was seven times as old as my sister; two years ago I was four times as old; last year I was three times as old; and this year I am two and a half times as old. What are their ages now?
Click here to see answer by ptaylor(2198)

Question 69894: Find the x intercepts
y = x^2 - 3x - 1
I do not understand how I am to find the intercepts formula, can anyone help me out on this one please, thank you!
Click here to see answer by ankor@dixie-net.com(22740)

Question 69976: Not sure how to solve this equation.
5x + 8 + 3x - x + 5 = 6x -3
Thanks
Kathy
Click here to see answer by checkley75(3666)

Question 69963: How would you find the number to Twenty-nine is 13 added to 4 times a number?
Click here to see answer by bucky(2189)

Question 68811: Solve for x. I did the following.
20 (2)=5*x-2
40=5x(-2)
40=-10
x=4
I believe I did it wrong but I am not for sure. Thank you in advance.
Click here to see answer by rapaljer(4671)

Question 69873: Solve:
5(x-2)^2 =3
I have four answers:
A) -5 plus minus sqrt3
B) 5 plus minus sqrt3
C) plus minus 4
D) plus minus sqrt 4
Can anyone help me solve this problem please? Thank you
Click here to see answer by ankor@dixie-net.com(22740)

Question 70089: Find the axis of symmetry:
Y= x^2 + 7x + 10
ASm I suppose to find out what x equals?? Or I am just suppose to find a solution to the problem? Thank you
Click here to see answer by stanbon(75887)

Question 70088: Find the x-intercepts:
y = x^2 - 3x - 1
How do I do this problem? I am confused on this one completely! Thank you for your help!
Click here to see answer by stanbon(75887)

Question 70086: I was able to use the quadratic calculator for some of the problems, but this one I do not think I can:
Solve by using the quadratic formula:
x^2 = 5x - 5
Please help! Thank you
Click here to see answer by checkley75(3666)

Question 70085: I am having some awful troubles trying to figure out a few problems...
Solve:
(x+5)^2 = 3
Can anyone help me grasp this please? Thank you so much!
Click here to see answer by Earlsdon(6294)

Question 68767: factor.
8y+24
Click here to see answer by jim_thompson5910(35256)

Question 70092: Chris cuts half a rectangle lawn, 40m by 30m, by mowing strips of equal width around the perimeter. Jonah cuts the small rectangle left. How wide a strip does Chris cut so that they share the work equally?
Click here to see answer by checkley75(3666)

Question 69974: complete the ordered pairs for the equation:
2x + y = 10.
(5, ), ( , 10), ( , -2), (0, ).
Click here to see answer by checkley75(3666)

Question 68813: How do you simplify w+3/4w divided by w-3/2w? Thank you in advance for your help with this problem.
Click here to see answer by jim_thompson5910(35256)

Question 70096: Rewrite the equation �8x � 5y = �45 as a function of x.
Click here to see answer by bucky(2189)

Question 70106: The difference when 7 less than a number is subtracted from twice the number is 12. What is the number?
Click here to see answer by psbhowmick(878)

Question 70107: Four less than three times a number is three more than two times the number. What is the number?
Click here to see answer by funmath(2933)

Question 70107: Four less than three times a number is three more than two times the number. What is the number?
Click here to see answer by psbhowmick(878)

Question 70107: Four less than three times a number is three more than two times the number. What is the number?
Click here to see answer by Edwin McCravy(20054)

Question 70111: 5m+9=3(m-5)+7
Click here to see answer by bucky(2189)

Question 70111: 5m+9=3(m-5)+7
Click here to see answer by funmath(2933)

Question 70115: 5m+9=3(m-5)+7
Click here to see answer by Edwin McCravy(20054)

Question 70116: 2(x+7)=5(x-7)
Click here to see answer by funmath(2933)

Question 70110: 2(x+7)=5(x-7)
Click here to see answer by funmath(2933)

Question 70196: what is m+m= plez i need it...thankyou
Click here to see answer by stanbon(75887)

Question 70206: Find the equation of the line passing through the points {1/5 , 7} , {-2 , 4}.
My problem here is that I don't know how to change the given point 1/5 into a whole number.
Click here to see answer by bucky(2189)

Question 70289: (4x-9y)-(5x-7y)+(2x-5y)
Click here to see answer by checkley75(3666)

Question 70360: If f(x)=5x-1, find the following:
f(a-2)
Click here to see answer by bucky(2189)

Question 70356: Rewrite the equation as a function of x.
-3x + 4y = 11
Click here to see answer by bucky(2189)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180, 18181..18225, 18226..18270, 18271..18315, 18316..18360, 18361..18405, 18406..18450, 18451..18495, 18496..18540, 18541..18585, 18586..18630, 18631..18675, 18676..18720, 18721..18765, 18766..18810, 18811..18855, 18856..18900, 18901..18945, 18946..18990, 18991..19035, 19036..19080, 19081..19125, 19126..19170, 19171..19215, 19216..19260, 19261..19305, 19306..19350, 19351..19395, 19396..19440, 19441..19485, 19486..19530, 19531..19575, 19576..19620, 19621..19665, 19666..19710, 19711..19755, 19756..19800, 19801..19845, 19846..19890, 19891..19935, 19936..19980, 19981..20025, 20026..20070, 20071..20115, 20116..20160, 20161..20205, 20206..20250, 20251..20295, 20296..20340, 20341..20385, 20386..20430, 20431..20475, 20476..20520, 20521..20565, 20566..20610, 20611..20655, 20656..20700, 20701..20745, 20746..20790, 20791..20835, 20836..20880, 20881..20925, 20926..20970, 20971..21015, 21016..21060, 21061..21105, 21106..21150, 21151..21195, 21196..21240, 21241..21285, 21286..21330, 21331..21375, 21376..21420, 21421..21465, 21466..21510, 21511..21555, 21556..21600, 21601..21645, 21646..21690, 21691..21735, 21736..21780, 21781..21825, 21826..21870, 21871..21915, 21916..21960, 21961..22005, 22006..22050, 22051..22095, 22096..22140, 22141..22185, 22186..22230, 22231..22275, 22276..22320, 22321..22365, 22366..22410, 22411..22455, 22456..22500, 22501..22545, 22546..22590, 22591..22635, 22636..22680, 22681..22725, 22726..22770, 22771..22815, 22816..22860, 22861..22905, 22906..22950, 22951..22995, 22996..23040, 23041..23085, 23086..23130, 23131..23175, 23176..23220, 23221..23265, 23266..23310, 23311..23355, 23356..23400, 23401..23445, 23446..23490, 23491..23535, 23536..23580, 23581..23625, 23626..23670, 23671..23715, 23716..23760, 23761..23805, 23806..23850, 23851..23895, 23896..23940, 23941..23985, 23986..24030, 24031..24075, 24076..24120, 24121..24165, 24166..24210, 24211..24255, 24256..24300, 24301..24345, 24346..24390, 24391..24435, 24436..24480, 24481..24525, 24526..24570, 24571..24615, 24616..24660, 24661..24705, 24706..24750, 24751..24795, 24796..24840, 24841..24885, 24886..24930, 24931..24975, 24976..25020, 25021..25065, 25066..25110, 25111..25155, 25156..25200, 25201..25245, 25246..25290, 25291..25335, 25336..25380, 25381..25425, 25426..25470, 25471..25515, 25516..25560, 25561..25605, 25606..25650, 25651..25695, 25696..25740, 25741..25785, 25786..25830, 25831..25875, 25876..25920, 25921..25965, 25966..26010, 26011..26055, 26056..26100, 26101..26145, 26146..26190, 26191..26235, 26236..26280, 26281..26325, 26326..26370, 26371..26415, 26416..26460, 26461..26505, 26506..26550, 26551..26595, 26596..26640, 26641..26685, 26686..26730, 26731..26775, 26776..26820, 26821..26865, 26866..26910, 26911..26955, 26956..27000, 27001..27045, 27046..27090, 27091..27135, 27136..27180, 27181..27225, 27226..27270, 27271..27315, 27316..27360, 27361..27405, 27406..27450, 27451..27495, 27496..27540, 27541..27585, 27586..27630, 27631..27675, 27676..27720, 27721..27765, 27766..27810, 27811..27855, 27856..27900, 27901..27945, 27946..27990, 27991..28035, 28036..28080, 28081..28125, 28126..28170, 28171..28215, 28216..28260, 28261..28305, 28306..28350, 28351..28395, 28396..28440, 28441..28485, 28486..28530, 28531..28575, 28576..28620, 28621..28665, 28666..28710, 28711..28755, 28756..28800, 28801..28845, 28846..28890, 28891..28935, 28936..28980, 28981..29025, 29026..29070, 29071..29115, 29116..29160, 29161..29205, 29206..29250, 29251..29295, 29296..29340, 29341..29385, 29386..29430, 29431..29475, 29476..29520, 29521..29565, 29566..29610, 29611..29655, 29656..29700, 29701..29745, 29746..29790, 29791..29835, 29836..29880, 29881..29925, 29926..29970, 29971..30015, 30016..30060, 30061..30105, 30106..30150, 30151..30195, 30196..30240, 30241..30285, 30286..30330, 30331..30375, 30376..30420, 30421..30465, 30466..30510, 30511..30555, 30556..30600, 30601..30645, 30646..30690, 30691..30735, 30736..30780, 30781..30825, 30826..30870, 30871..30915, 30916..30960, 30961..31005, 31006..31050, 31051..31095, 31096..31140, 31141..31185, 31186..31230, 31231..31275, 31276..31320, 31321..31365, 31366..31410, 31411..31455, 31456..31500, 31501..31545, 31546..31590, 31591..31635, 31636..31680, 31681..31725, 31726..31770, 31771..31815, 31816..31860, 31861..31905, 31906..31950, 31951..31995, 31996..32040, 32041..32085, 32086..32130, 32131..32175, 32176..32220, 32221..32265, 32266..32310, 32311..32355, 32356..32400, 32401..32445, 32446..32490, 32491..32535, 32536..32580, 32581..32625, 32626..32670, 32671..32715, 32716..32760, 32761..32805, 32806..32850, 32851..32895, 32896..32940, 32941..32985, 32986..33030, 33031..33075, 33076..33120, 33121..33165, 33166..33210, 33211..33255, 33256..33300, 33301..33345, 33346..33390, 33391..33435, 33436..33480, 33481..33525, 33526..33570, 33571..33615, 33616..33660, 33661..33705, 33706..33750, 33751..33795, 33796..33840, 33841..33885, 33886..33930, 33931..33975, 33976..34020, 34021..34065, 34066..34110, 34111..34155, 34156..34200, 34201..34245, 34246..34290, 34291..34335, 34336..34380, 34381..34425, 34426..34470, 34471..34515, 34516..34560, 34561..34605, 34606..34650, 34651..34695, 34696..34740, 34741..34785, 34786..34830, 34831..34875, 34876..34920, 34921..34965, 34966..35010, 35011..35055, 35056..35100, 35101..35145, 35146..35190, 35191..35235, 35236..35280, 35281..35325, 35326..35370, 35371..35415, 35416..35460, 35461..35505, 35506..35550, 35551..35595, 35596..35640, 35641..35685, 35686..35730, 35731..35775, 35776..35820, 35821..35865, 35866..35910, 35911..35955, 35956..36000, 36001..36045, 36046..36090, 36091..36135, 36136..36180, 36181..36225, 36226..36270, 36271..36315, 36316..36360, 36361..36405, 36406..36450, 36451..36495, 36496..36540, 36541..36585, 36586..36630, 36631..36675, 36676..36720, 36721..36765, 36766..36810, 36811..36855, 36856..36900, 36901..36945, 36946..36990, 36991..37035, 37036..37080, 37081..37125, 37126..37170, 37171..37215, 37216..37260, 37261..37305, 37306..37350, 37351..37395, 37396..37440, 37441..37485, 37486..37530, 37531..37575, 37576..37620, 37621..37665, 37666..37710, 37711..37755, 37756..37800, 37801..37845, 37846..37890, 37891..37935, 37936..37980, 37981..38025, 38026..38070, 38071..38115, 38116..38160, 38161..38205, 38206..38250, 38251..38295, 38296..38340, 38341..38385, 38386..38430, 38431..38475, 38476..38520, 38521..38565, 38566..38610, 38611..38655, 38656..38700, 38701..38745, 38746..38790, 38791..38835, 38836..38880, 38881..38925, 38926..38970, 38971..39015, 39016..39060, 39061..39105, 39106..39150, 39151..39195, 39196..39240, 39241..39285, 39286..39330, 39331..39375, 39376..39420, 39421..39465, 39466..39510, 39511..39555, 39556..39600, 39601..39645, 39646..39690, 39691..39735, 39736..39780, 39781..39825, 39826..39870, 39871..39915, 39916..39960, 39961..40005, 40006..40050, 40051..40095, 40096..40140, 40141..40185, 40186..40230, 40231..40275, 40276..40320, 40321..40365, 40366..40410, 40411..40455, 40456..40500, 40501..40545, 40546..40590, 40591..40635, 40636..40680, 40681..40725, 40726..40770, 40771..40815, 40816..40860, 40861..40905, 40906..40950, 40951..40995, 40996..41040, 41041..41085, 41086..41130, 41131..41175, 41176..41220, 41221..41265, 41266..41310, 41311..41355, 41356..41400, 41401..41445, 41446..41490, 41491..41535, 41536..41580