Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 6 - Systems of Equations and Inequalities - Common Core Cumulative Standards Review - Selected Response - Page 413: 6


Answer I

Work Step by Step

The width of Ben's rectangular family room is 3 ft less than the length. $w=l-3$ The perimeter is 70 ft: $P=2(l+w)=70$ Using substitution: $2(l+w)=70$ $2(l+l-3)=70$ $2(2l-3)=70$ Hence, the correct answer is I.
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