7) The question gives you the equation to use to find her pay. Substitute 13 hours in for x.
80 + 15(13 - 8) → 80 + 15(5) → 80 + 75 → $155
8) combine like terms (8y with -5y and 9 with -12) so 8y - 5y = 3y and 9 - 12 = -3so the new expression is 3y - 3
