What is the value of the x variable in the solution to the following system of equations?

4x + 2y = 12

x – y = 3

Question

What is the value of the x variable in the solution to the following system of equations?

4x + 2y = 12
 
 x – y = 3

anonymous · Answer

Write y from the second equation in terms of x, y=x-3 and plug it in the first equation. 
4x+2(x-3)=12   =>  4x+2x-6=12  =>  x=1. Now go back to y=x-3, plug x=1, and you get y=2. So your solution set is {(1,2)}.

anonymous · Answer

Choices.......
0

–3

3

2

anonymous · Answer

4x + 2y = 12
x – y = 3 so x=y+3

then substitute 
4(y+3)+2y=12   y=0

then x=y+3      x=3

anonymous · Answer

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