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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 983857: How would I solve something like this???
1.Which of the following are NOT linear systems. In each case explain why.
a.−2x+3y=7.5
7x−2y=−2.5
b.x2+y2=4
2x+2y=7
c.5x−3y=12
y=3x−8
d.4x−7y=−4
3x+2xy=8

Click here to see answer by MathLover1(20850)

Question 983873: Solve each equation for y. Then find the value of y for each value of x.
x = 9 � 3y; x = �3, 6, 12
Click here to see answer by macston(5194)

Question 984027: Find the area of a triangle bounded by the x-axis,y-axis and the line 3x - 4y=12
Click here to see answer by Alan3354(69443)

Question 984027: Find the area of a triangle bounded by the x-axis,y-axis and the line 3x - 4y=12
Click here to see answer by Boreal(15235)

Question 984063: 4 (�+y)^2-20 (�+y)z+25z^2
Click here to see answer by solver91311(24713)

Question 984222: 3x+2y=14
x+-12y=-8
I know the answer I just don't know how to solve it by elimination, could you help?
Click here to see answer by Boreal(15235)

Question 984222: 3x+2y=14
x+-12y=-8
I know the answer I just don't know how to solve it by elimination, could you help?
Click here to see answer by MathLover1(20850)

Question 984332: x + y = 0
x - y + 2 = 0
This is really confusing me! I get that x=0 and y=0. Is this right? If not then what is correct? How would I graph it? Very urgent. Can you help me right now? My email is lifeisgood4a@cotc.net
Thank you!
Click here to see answer by macston(5194)

Question 984355: ABC corportion is making a rectangular sign that is 20 ft. long with trim around the edges. What are the possible widths the sign can be if there is at most 48 ft. of trim?
Click here to see answer by solver91311(24713)

Question 984408: Please help I need to know if 34=-2(23-y)+4(y-4) has no solution, has all real numbers in the solution or the solution set is {?}
Click here to see answer by Boreal(15235)

Question 984423: How many solutions does the following system of equations have? Justify your answer.
-2x + 4y = 1
3x - 6y = 9
Its been a few years since I've had to do this. Can you explain the process for me please?
Click here to see answer by solver91311(24713)

Question 984530: What is the solution to the linear equation?
�12 + 3b � 1 = �5 � b
Click here to see answer by MathLover1(20850)

Question 984578: Find an equation of the line through the pair of points. Write the equation in the form Ax + By = C. (3, 0) and (8, 2) 4)
Click here to see answer by josgarithmetic(39617)

Question 984646: the two lines a1x+b1y+c1=0 and a2x+b2y+c2=0 are identical if
Click here to see answer by Theo(13342)

Question 984646: the two lines a1x+b1y+c1=0 and a2x+b2y+c2=0 are identical if
Click here to see answer by ikleyn(52782)

Question 984768: 8x+5y=11 and 3x-4y=10
Click here to see answer by Cromlix(4381)

Question 984858: Word problem
Christie Heinrich has candy that sells for $1.30 per pound, to be mixed with candy selling for $0.90 per pound to get 100 pounds of a mix that will sell for $1 per pound. How much of each type should she use?
Click here to see answer by josgarithmetic(39617)

Question 984877: can you help me solve the problem y=25x+40 please show me the process.
Click here to see answer by josgarithmetic(39617)

Question 984878: can you help me solve the problem y=25x+40 please show me the process.
Click here to see answer by solver91311(24713)

Question 984916: 7-8y=31-6x
Click here to see answer by Alan3354(69443)

Question 985007: 7x+3y=27 & 2x+5y=16 have. infinite, many or no solution check.

Click here to see answer by josgarithmetic(39617)

Question 985017: Solve the system by substitution method.
x=8y-11
6x-6y=-24
Click here to see answer by josgarithmetic(39617)

Question 985020: 100 - (3x + 2y) = 50
Click here to see answer by macston(5194)

Question 985089: What is the dimensions of a rectangle with a perimeter of 56 cm.if its width is 75% of its lenght?
Click here to see answer by Alan3354(69443)

Question 985106: How many quarts of pure antifreeze must be added to 7 quarts of 10% antifreeze to obtain 20% antifreeze solution?
Thank you!
Click here to see answer by josgarithmetic(39617)

Question 985365: solve graphically using whole numbers 5x-3y=2 15x-9y=6

Click here to see answer by vleith(2983)

Question 985450: what is the area of a rectangle that is 3x to the second power wide and 4x to fourth power y to the third power long
Click here to see answer by stanbon(75887)

Question 985601: X+3y-z=12
Click here to see answer by Alan3354(69443)

Question 985795: We have to solve the problem using Linear Equations. Here's the question... "All 28 members in Crestview High School's Ski Club went on a one-day ski trip. Members can rent skies for$16.00 per day or snow boards for $19.00 per day. The club paid a total of $478 for rental equipment. How many members rented skies & how many rented snowboards?
So far all I have is x= # of members rented skies ; y= # of members rented a snowboard
x+y=478
16x+19y=
Click here to see answer by macston(5194)

Question 986078: Please help me solve this solution, QUESTION: In a certain school it was found that 28% of the children came to school by car. The number of children coming by car was 231. There were 517 children walking to school. The other children came by PMV. What percentage of the children came by PMV?
Click here to see answer by thesvw(77)

Question 986074: Can you please help me with this home work?
QUESTION: A boy is paid $4 for each day he works and is fined $1 for each day he fails fails to work.After 20 days he is paid $50. For how many days did he work?
Click here to see answer by macston(5194)

Question 986086: what is the slope intercept from of -5x=4y+3

Click here to see answer by Alan3354(69443)

Question 986151: -2x-6=-6(1+5x)
Click here to see answer by solver91311(24713)

Question 986151: -2x-6=-6(1+5x)
Click here to see answer by Boreal(15235)

Question 986199: Solve the following system of equations by substitution and select the correct answer below:
4x-6y=28
8x-4y=24
a) x=1, y=4
b) x=-1, y=4
c) x=1, y=-4
d) x=-1, y=-4
Click here to see answer by Cromlix(4381)

Question 986219: Hello, im in need of some help.I was given 4x+3y=6. Then I was given a table of values.
x | y
_ | 2
3 | _
_ |-1
Those numbers were some given integers, the underscores are blank spaces to fill with numbers. It says to complete the above.
I came up with 4(3)+3(-2)=6.however it then says to then graph a line defined by the points. Wouldn't this have to be in y=mx+b form? it doesn't ask to put it into that form in the book...please help ill appreciate it very much.
Click here to see answer by stanbon(75887)

Question 986264: How do I set up a system of equations to solve this:
How many gallons of a 20% lemon and sugar solution must be mixed with how many gallons of a 40% lemon and sugar solution to make 10 gallons of a 28% lemon and sugar solution?
Click here to see answer by macston(5194)

Question 986289: Maximize z=2x+4y subject 2x+y>=4, x+y<=9, x,y>=0
Click here to see answer by Fombitz(32388)

Question 986531: It says:you are given the equation:y-2x+4=0 and they say determine the co-ordinates of this line,using the intercept-imtercept method showing oll calculation
Click here to see answer by solver91311(24713)

Question 986783: Solve the equation and then graph the solution.
10s + 20b = 80

Click here to see answer by solver91311(24713)

Question 986918: -2x-(x-1)+8=0

Click here to see answer by Edwin McCravy(20056)

Question 987050: Y=5x-1 2x-y=7
Click here to see answer by macston(5194)

Question 987106: The sum of a two digit number is 12. If the new number formed by reversing the digits is greater than the original number by 54, find the original number.

Click here to see answer by josgarithmetic(39617)

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