perimeter algebra one

Question

The perimeter of a rectangle is 72 cm. The relationship between the length, the width, and the perimeter of the rectangle can be described with the equation 2•length+2 width=72

find the length, in centimeters, if the width is

a. 10 cm

b. W cm

Answer 1

2L + 2W = 72

W = 10

2L + 2(10) = 72

2L + 20 = 72

2L = 52

L = 26

2L + 2W = 72

2L = 72 - 2W

L = (72-2W)/2

L = 36 - W