Algebra 1: Common Core (15th Edition)

$y=-4$
We need to get the y alone. Thus, we cancel out the subtraction by adding 3 on both sides. This leaves us with the equation $y/4=-1$. In order to cancel out division, we use multiplication, so we multiply both sides by 4 to get that $y=-4$. We plug -4 in for y and confirm that our answer is, indeed, correct.