Question

The area of a rectangle is 45 square inches. One dimension is 5 inches. What is the perimeter?

Answer 1

a=xy

y=a/x, a=45 and x=5 so

y=45/5

y=9

p=2(x+y), and we know that x=5 and y=9 so

p=2(5+9)

p=2(14)

p=28 in

Answer 2

width * length = 45 = area

lets let the width = 5
5 * length = 45
length = 45/5 = 9

so perimeter = 2w + 2L = 2(5) + 2(9) = 28