Chapter 2 - Solving Equations - 2-3 Solving Multi-Step Equations - Practice and Problem-Solving Exercises - Page 98: 10

y=4

We fist combine like terms to obtain that: $-1=-2y+7$. We need to get the y alone, so we cancel out the addition by subtracting 7 on both sides. This leaves us with the equation $-2y=-8.$ We cancel out multiplication by using division, so we divide both sides of the equation by -2 to get that y=4. We plug 4 in for y and confirm that our answer is, indeed, correct.