The perimeter of a rectangle is 61 centimeters.

Question

The length is 4.1 centimeters longer than the width, w. Which equation can be used to find the width of this rectangle?

Answer 1

L= length W=Width

2(L+W) = the perimeter = 61

L=4.1 + W

substitute 2nd equation into the first

2(4.1 + W + W) = 61

8.2 + 4W = 61

4W = 61 - 8.2 = 52.8

W = 52.8/4 = 13.2

L=4.1 + 13.2 = 17.3

Width = 13.2 cm. Length = 17.3 cm.