Question

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

4x + 2y = 12

x – y = 3

Answer 1

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)}.

Answer 2

Choices.......
0

–3

3

2

Answer 3

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

Answer 4

0