SOLUTION: The formula for the perimeter of a rectangle is P=2L+2W where L is the length and W is the width. A rectangle has a perimeter of 24 inches. Find its dimensions if it's length is 3

Algebra ->  Rectangles -> SOLUTION: The formula for the perimeter of a rectangle is P=2L+2W where L is the length and W is the width. A rectangle has a perimeter of 24 inches. Find its dimensions if it's length is 3       Log On


   

Question 19109: The formula for the perimeter of a rectangle is P=2L+2W where L is the length and W is the width. A rectangle has a perimeter of 24 inches. Find its dimensions if it's length is 3 inches greater than it's width. I kinda know what I'm doing but I need some help like explaining how to egt the answer with the work. But I'm not completely lost!
Answer by wuwei96815(245) About Me  (Show Source):
You can put this solution on YOUR website!
Let width = x because it is unknown.
Let length = x + 3" because it is 3" greater.

P = 2L + 2W
24" = 2(x+3") + 2(x)
24" = 2x + 6" + 2x
24" - 6" = 4x
18" = 4x
18"/4 = x
4.5" = x

To check the answer go back and substitute 4.5" for x in the equation and see if you get a perimeter of 24".