Question

The length of a rectangle is four times its width.

If the area of the rectangle is 144 ft, find its perimeter.

Answer 1

Answer: 60

suppose: the width of a rectangle is x (x > 0)

⇒ The length of a rectangle is 4x

because the area of the rectangle is 144 ft

=> 4x.x = 144

⇔ x² = 144/4 = 36

⇒ x = 6

with x = 6 ⇒ The length of a rectangle is 4.6 = 24

the perimeter of the rectangle is (6 + 24).2 = 60

Explanation:

Answer 2

y = mx + c

since m = 0

c = 9