Question

The length of a rectangle is five inches shorter than triple it’s width. Write the perimeter P of the rectangle as a function of the rectangle width

Answer 1

P = 8w+10

Explanation:

To find the dimensions, create an equation for its perimeter and solve. Recall, the perimeter formula for a rectangle is P = 2l+2w. The length is 5 inches shorter than triple its width so 3w-5. And the width is w.

P = 2l+2w

P = 2(3w-5) + 2w

P = 6w-10+2w

P=8w+10