SOLUTION: Solve the system by addition: x-4y=-6 2x+y=15

Question 850997: Solve the system by addition:
x-4y=-6
2x+y=15
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Multiply both sides of equation 2 by 4 to get

x-4y=-6
2x+y=15

x-4y=-6
4(2x+y)=4*15

x-4y=-6
8x+4y=60

Now add the equations

x-4y=-6
8x+4y=60
---------
9x+0y=54

So that means ---->

Now that we know that , we can use this to find y.

Pick any equation with x and y in it, plug in and solve for y. I'm going to use the first equation.

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So, and
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