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

Tracy put (-2y-2) where x is in the second equation. This resulted in
  2(-2y-2) +3y = -6
After eliminating parentheses, Tracy had
  -4y -4 +3y = -6

The 4th selection is appropriate:
  -4y - 4 + 3y = -6