Question

Tracy solved the system of equations by making a substitution for x in the second equation.

What equation did she get as a result of that substitution?
x = –2y – 2
2x + 3y = –6

–2y – 2 = –6
–2y + 1 = –6
-4y – 2 + 3y = –6
–4y – 4 + 3y = –6

Answer 1

I: x = –2y – 2
II: 2x + 3y = –6

substitute I's x (x = –2y – 2) definition into II:
2*(-2y-2) + 3y = –6
-4y-4+3y=-6

which is the last option