SOLUTION: Im haveing a problem figureing out how to set this equation up. a rectangle has a perimeter of 54 inches. the length of the rectangle is one less then three times the width. fin

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Question 268554: Im haveing a problem figureing out how to set this equation up. a rectangle has a perimeter of 54 inches. the length of the rectangle is one less then three times the width. find the length and width of the rectangle
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
L=3W-1
2L+2W=54
2(3W-1)+2W=54
6W-2+2W=54
8W=54+2
8W=56
W=56/8
W=56/8
W=7 ANS. FOR THE WIDTH.
L=3*7-1
L=21-1=20 ANS. FOR THE LENGTH.
PROOF:
2*20+2*7=54
40+14=54
54=54