Questions on Algebra: Systems of Linear Equations answered by real tutors!

Tutors Answer Your Questions about Linear-systems (FREE)

Question 856336: How do you solve systems of equations using substitution , for example how would you solve y=2x and 3x+3y=-18
Click here to see answer by Alan3354(69443)

Question 856603: "A bank teller has 35 bills in $5, $10, and $20 denominations. The total value from these bills is $370. The total number of $10 bills and $20 bills is 7 more than the number of $5. How many bills of each denomination does the teller have?"
What I have done:
x+y+z=35
5x+10y+20z=370
y+z+7=x
Then I keep getting fractions/decimals which is not correct
Click here to see answer by Fombitz(32388)

Question 856805: describe and correct the error in solving the linear system. 9x + 8y = 11 and 7x + 6y = 9
Click here to see answer by stanbon(75887)

Question 856526: which order is not a function.

Click here to see answer by tommyt3rd(5050)

Question 856993: Write an equation in standard form of the line that passes through (7, -3) and has a y-intercept of 2.
Could I please have an explanation on how to solve this?

Click here to see answer by JulietG(1812)

Question 857008: Write an equation in standard form of the line that passes through (3, 1) and has a y-intercept of -2.
Can I have an explanation on how to do this?
Click here to see answer by Fombitz(32388)

Question 857190: hi - trying to help my middle schooler with this problem - i need help!
Flying with the wind, a pilot travels 600 miles twn 2 cities in 4 hours. The return trip into the wind takes 5 hours. The speed of the wind remains constant during the trip. Find the average speed of the plane with no wind and the speed of the wind.
Thank you!!
Click here to see answer by lwsshak3(11628)

Question 857349: The question is : The probability of guessing the correct answer to certain question is X/2. if probability of not guessing the correct answer is 2/3, then find X.
Click here to see answer by Fombitz(32388)

Question 857347: if line 2x + ky = 5 passes through the point (-2, 1), find k. This is the question
Click here to see answer by Fombitz(32388)

Question 857366: Can you help me to solve these two equation by using elimination and substitution method.
6x + 3y = 0
-3x + 3y = 9
2x + 4y = -6
x -3y = 7
Click here to see answer by richwmiller(17219)

Question 857386: use quadratic formula to solve: x^2+6x+34=0
Click here to see answer by Fombitz(32388)

Question 857348: The question is : Mean of 20 observations is 17. If in the observations, observation 40 is replaced by 12, find the new mean.
Click here to see answer by ankor@dixie-net.com(22740)

Question 857663: Solve the linear equations 2x+4y=10 and 3x+6y=15.
Click here to see answer by richwmiller(17219)

Question 857683: divide rs 25000 between a,b and c so that a gets 7/8 of b and c gets 2/3 of a and b.
Click here to see answer by dkppathak(439)

Question 857730: Can you help me to solve this equation by using substitution method.
x = 5y + 8
4x + 2y = 10
Click here to see answer by Fombitz(32388)

Question 857937: The perimeter of rectangle is 100 feet. If its length is 2 feet longer than three times its width, find the length and width.
Click here to see answer by Seutip(231)

Question 857965: How do I solve this
(-5)/5 -7 I am trying to check this equation:7=c/5 -7 for which c=-5
Thank You!
Click here to see answer by jim_thompson5910(35256)

Question 857373: Write an equation in standard form for the line whose slope is undefined and passes through (-6,4).
I'm really having trouble with this problem. Could someone explain how to do this?
Click here to see answer by tommyt3rd(5050)

Question 858151: Find the solution to the system of equation below
4x + 7y = -1
x + y = 5
Click here to see answer by ben720(159)

Question 858240: The sum of the digits of a two-digit number is 13. the value of the number is 2 more than 7 times the units digit

Click here to see answer by lwsshak3(11628)

Question 858671: Y=4x+4
Y=-3x-3
Click here to see answer by Fombitz(32388)

Question 859075: square root of 3x-2=4
Click here to see answer by Fombitz(32388)

Question 859084: What is the solution to:
2x+y=6, 3x-2y=2 using substitution?
Click here to see answer by Fombitz(32388)

Question 859221: determine the value of k such that two lines y=(k+1)x-4 and y=(4k-8)x-12 will never intersect. Enter your answer as k=number
Click here to see answer by ewatrrr(24785)

Question 859318: 3x-11y=20
2x=4y+10
Click here to see answer by JulietG(1812)

Question 859515: Is 4x - 3 + 6x equivalent to -5x - 3 + 3x

Click here to see answer by stanbon(75887)

Question 859928: A building worth $828,000 is depreciated for tax purposes by its owner using the straight-line depreciation method. The value of the building y, after x months of use, is given by y=828,000-2200x dollars. After how many years will the value of the building be $722,400?

Click here to see answer by ewatrrr(24785)

Question 860166: 10y+7-4y=-5+6y+22
help?
Click here to see answer by Fombitz(32388)

Question 860382: Use algebra to find the point at which the line k(x) = -1/2 x + 25/8 intersects the line h(x) = 5/4 x + 155/16.
We're solving 2x2 systems using graphing but I don't recognize the k(x) and the h(x).
Click here to see answer by Alan3354(69443)

Question 860674: x+2y-3z=2
3x-z=-8
2x-3y+5z=-9
Click here to see answer by ewatrrr(24785)

Question 860654: i have a word problem i'm having trouble solving.
Modeling Distance to a rising Weather Balloon with a Radical Relation.
A meteorologist is positioned 100 m from the point where a weather balloon is launched.
If the weather balloon is rising vertically and the meteorologist remains fixed in his position, find an equation that describes the distance, d, between the meteorologist and the balloon in terms of the height, h, of the balloon vertically above the ground.
Click here to see answer by ankor@dixie-net.com(22740)

Question 860688: x+2y-3z=2
3x-z=-8
2x-3y+5z=-9
by elimination
Click here to see answer by Fombitz(32388)

Question 861032: Which set of points are on the line y = 6x - 2?
A.{(0, -2), (6, 34)}
B.{(0, -2), (34, 6)}
C.{(-2, 0), (34, 6)}
D.{(-2, 0), (6, 34)}
I say A. is the correct answer. Am I right?
Click here to see answer by ewatrrr(24785)

Question 861045: Draw a line with a slope of 1/4 through the point (0,-4)

Click here to see answer by ewatrrr(24785)

Question 861067: Simplify.
(8x)2 + 82x My Ans. 64x(x + 1)
Am I correct?
Click here to see answer by ewatrrr(24785)

Question 861086: Identify the solution(s) of the system of equations, if any.
3x+2y=4
5x-4y=3

Click here to see answer by ewatrrr(24785)

Question 861095: Which line is perpendicular to the line y =1/2 x + 9?
Click here to see answer by ewatrrr(24785)

Question 861094: What set of points are on the line: y = 6x - 2? Ans.
Click here to see answer by ewatrrr(24785)

Question 861323: identify the solution (s) of the system of equation. If any
-6x-2y=18
2y=-6x-18
Click here to see answer by math-vortex(648)

Question 861470: Which set of points are on the line y = 6x - 2?
{(0, -2), (34, 6)}
{(0, -2), (6, 34)}
{(-2, 0), (34, 6)}
{(-2, 0), (6, 34)}
Ans. {(0,-2), (6,34)}

Click here to see answer by richwmiller(17219)

Question 861477: Which line is perpendicular to the line y =1/2 x + 9?
Ans. y = - 2x + 3

Click here to see answer by richard1234(7193)

Question 861432: Which line is perpendicular to the line y =1/2 x + 9?
Ans. y = - 2x + 3
AM I correct?

Click here to see answer by ewatrrr(24785)

Question 861431: Which set of points are on the line y = 6x - 2?
{(0, -2), (34, 6)} {(0, -2), (6, 34)} {(-2, 0), (34, 6)} {(-2, 0), (6, 34)}
I say the answer is {(0,-2), (6, 34)}Am I correct?
Click here to see answer by ewatrrr(24785)

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