### Home > AC > Chapter 3 > Lesson 3.1.6 > Problem3-58

3-58.

Write an expression that represents the perimeter of the shape built with algebra tiles below. Then find the perimeter if $x=3$ units and $y=7$ units. Homework Help ✎

Find the length of each side, and then sum the lengths.

Once you find an expression for the perimeter, substitute 3 for $x$ and 7 for $y$.

28 units