SOLUTION: If the perimeter of a rectangle is 18 ft and the width is 5 ft, find its length. [Hint: The perimeter of a rectangle is given by P = 2L + 2W.]

Algebra ->  Algebra  -> Square-cubic-other-roots -> SOLUTION: If the perimeter of a rectangle is 18 ft and the width is 5 ft, find its length. [Hint: The perimeter of a rectangle is given by P = 2L + 2W.]      Log On

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Question 70321: If the perimeter of a rectangle is 18 ft and the width is 5 ft, find its length. [Hint: The perimeter of a rectangle is given by P = 2L + 2W.]
Answer by 303795(562) About Me  (Show Source):
You can put this solution on YOUR website!
P = 2L + 2W
Substitute in the known values of perimeter and width.
18 = 2L + 2*5
18 = 2L + 10
Subtract 10 from each side of the equation
18 - 10 = 2L + 10 - 10
8 = 2L
Divide each side by 2 to get
4 = L
ie the length is 4 feet.