## Algebra 1

Use cross multiplication since the variable is on both sides of the proportion. $\frac{b+13}{2}=\frac{-5b}{3}$ cross multiply $3(b+13)=2(-5b)$ distributive property $3b+39=-10b$ subtract 3b from both sides $3b+39-3b=-10b-3b$ combine like terms $39=-13b$ divide both sides by -13 $39\div-13=-13b\div-13$ $-3=b$