Use the three steps to solve the problem.

The length of a rectangle is 3 times the width, and the perimeter is 22. Find the dimensions of the rectangle.

(Width is, Length is

Width (W) = x (unknown)

Length (L) = 3 times the width = 3W = 3x

Perimeter (P) = 22

Formula:

P = 2 (L+W)

Substitution,

22 = 2 (3W + W)

22 = 2 (3x + x)

22/2 = 4x

x = 2.75 (width)

Therefor the length (L) = 3 W = 3 (2.75)

L = 8.25

To check:

P = 2 (L + W)

22 = 2 (8.25 + 2.75)

22 = 2 (11)

22 = 22