## Prealgebra (7th Edition)

$y=-3$
$8y+7y=-45\rightarrow$ combine like terms $15y=-45\rightarrow$ divide both sides by 15 $15y\div15=-45\div15\rightarrow$ simplify $y=-3$ Check the soution by plugging in the value for y and determine whether the resulting equation is true. $8(-3)+7(-3)=-45\rightarrow$ simplify $-24+(-21)=-45\rightarrow$ simplify $-45=-45$ This is true so the solution is correct.