## Algebra 1

perimeter $\leq 12$ Substitute the given side length in the formula for perimeter. Let s be the length of the unknown side. $2(5)+s\leq12$ $\longrightarrow$ multiply $10+s\leq12$ $\longrightarrow$ subtract 10 from both sides $10+s-10\leq12-10$ $\longrightarrow$ simplify $s\leq2$