SOLUTION: Please help me solve problems. Solve by the elimination method. 4x+3y=-12 9x-3y=-105 ----------- 12x+9y=-36 27x-9y=-315 39x=351 x=351/39 y=? ----------- -- Solve b

Question 202625: Please help me solve problems.
Solve by the elimination method.
4x+3y=-12
9x-3y=-105
------------
12x+9y=-36
27x-9y=-315
39x=351
x=351/39
y=?
--------------
Solve by the elimination method.
4x-8y=5
4x-8y=6
Thank you!!!
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Solve by the elimination method.
4x+3y=-12
9x-3y=-105
---
Add the two equations to get:
13x = -117
x = 9
Substitute into 4x+3y=-12 to solve for "y":
4*9 + 3y = -12
3y = -12-36
y = -16
------------
12x+9y=-36
27x-9y=-315
39x=351
x=351/39
y=9
Substitute into 12x+9y = -36 to solve for "x":
12x + 9*9 = -36
12x = -127/12
--------------
Solve by the elimination method.
4x-8y=5
4x-8y=6
---
Subtract to get:
0 = 1
This is a contradiction.
There is no solution.
====================================
Cheers,
Stan H.

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