Algebra
posted by Libby .
The perimeter of a rectangle equals the sum of its lengths of its 4 sides. If the width of a rectangle is 4 inches and its perimeter is 38 inches, find the length of the rectangle.

P = Perimeter
L = Legth
W = Width
P = 2 L + 2 W = 2 ( L + W )
38 = 2 ( L + 4 ) Divide both sides by 2
19 = L + 4 Subtract 4 to both sides
19  4 = L + 4  4
15 = L
L = 15 in