SOLUTION: A rectangle's length is 3 feet less than twice its width. The perimeter is 42 feet. What is the length?

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Question 167056: A rectangle's length is 3 feet less than twice its width. The perimeter is 42 feet. What is the length?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
L=2W-3
P=2L+2W
42=2(2W-3)+2W
42=4W-6=2W
42=6W-6
6W=42+6
6W=48
W=48/6
W=8 ANSWER FOR THE WIDTH.
L=2*8-3
L=16-3
L=13 ANSWER FOR THE LENGTH.
PROOF:
42=2*13+2*8
42=26+16
42=42