Question

If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to y from the second equation is substituted into the first equation.

2x – 7y = 4
3x + y = –17

Answer 1

D: 2x-7(-3x-17)=4

Explanation:

1) Solve for y

3x+y=-17

Subtract 3x from both sides to isolate y

y=-3x-17

2) Substitute into the first equation (2x-7y=4)

We solved for y, so replace y with -3x-17

2x-7(-3x-17)=4 !