Answer
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.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
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
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