SOLUTION: Find the dimensions of a rectangle with a perimeter of 90 cm if the length is 5 cm less than four times the width.

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Question 280887: Find the dimensions of a rectangle with a perimeter of 90 cm if the length is 5 cm less than four times the width.
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
L=4W-5
2L+2W=90
2(4W-5)+2W=90
8W-10+2W=90
10W=90+10
10W=100
WE=100/10
W=10 ANS. FOR THE WIDTH.
L=4*10-5=40-5=35 ANS. FOR THE LENGTH.
PROOF:
2*35+2*10=90
70+20=90
90=90