The length of a rectangle is 3 feet less than 4 times the width. If the perimeter is 84 feet, find the length and the width of the rectangle.

Answer 1

L + w = 42
L + 3 = 4 w

42 - w + 3 = 4 w

5 w = 45 etc

Answer 2

P = 2L + 2W

84 = 2(4W - 3) + 2W

84 = 10W - 6

90 = 10W

9 = W

Answer 3

9x4-3=33 l