# The length L of a rectangle is 9 feet shorter than 4 times its width W. What is the perimeter of the rectangle in terms of its width alone?

##### 1 Answer

May 9, 2016

#### Explanation:

length = 4 x width - 9.

P = 2w + 2L

Substitute into eqn above:

P=2w + 2(4w-9) = 2w + 8w - 18 = 10w - 18 where w = width and L = length