### Home > CCAA8 > Chapter 4 Unit 5 > Lesson CCA: 4.1.1 > Problem4-14

4-14.

Solve this problem by writing and solving an equation. Be sure to define your variable.

A rectangle has a perimeter of $30$ inches. Its length is one less than three times its width. What are the length and width of the rectangle?

Set up two equations:
$3W−1=L$
$2W+2L=30$

Substitute $(3W−1)$ for $L$ and solve the equation:
$2W+2(3W−1)=30$

Width is $4$ inches and length is $11$ inches.