SOLUTION: Find the dimensions of a rectangle with a perimeter of 42 cm if the length is 7 cm less than three times the width.

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Question 622273: Find the dimensions of a rectangle with a perimeter of 42 cm if the length is 7 cm less than three times the width.
Answer by solver91311(24713) About Me  (Show Source):
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If a rectangle with perimeter has a length that is units longer (or shorter if ) than times the width, ,

Then knowing that the Perimeter is given by:

,

make the substitution:



Then solve for







For your problem: , , and . Do the arithmetic.

John

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