Question

how do I get the formula from this. The length of a rectangle is 3 times the width. The perimeter is 72 feet. find the dimensions of the rectangle.

Answer 1

Let x = width of a rectangle
Length of rectange = 3x (as 3 times the width)
3x+x=72
4x = 72
x = 18

Therefore width of rectangle = 18 feet
and Length = 3x = 3 x 18 = 54 feet

Answer 2

Thank you. so you just plug in the answer for x for the length.

Answer 3

Since Length is 3x
3 * 18 = 54 which is the length