Question

The length of a rectangle is 3 cm more than twice its width. If the perimeter of the rectangle is 54 cm, find the length of the rectangle

Answer 1

Set up a system of equations.
w = width
3+2w = length
if the perimeter is 54, use that as the total of all the sides.

w+w+3+2w+3+2w = 54
6w+6=54
6w=48
w=8

3+2(8) = 19

so the width is 8 cm and the length is 19 cm.