The variable W represents the width of a rectangle. The length of the rectangle, L, is 5 less than twice the width.
Write an expression for the length of the rectangle in terms of W.
Write a simplified expression for the perimeter of the rectangle in terms of W.
Find the perimeter of the rectangle if the width is 3 inches.
Well W = 3
L = (2W)-5 = (6) - 5 = 1
W + W + L + L = perimeter
so 2W + 2L = perimeter
so subbing 2W-5 in for L we get