the length of a rectangle is 3 centimeters less than twice its width. if the perimeter of the rectangle is 18 centimeters l, find its dimensions.

Answer 1

Using w for width, set the length to be 2w - 3. Then 2 widths (w) + 2 lengths (2w-3) = 18.

Solve 2w + 2(2w-3) = 18

2w + 4w - 6 = 18

6w - 6 = 18

6w = 24

w = 4 and therefore length = 2(4) - 3 = 5