Answer
30 inches by 42 inches
Work Step by Step
perimeter = 144 inches, length is 12 inches longer than width
$2x+2y=144$
$x=12+y$
$2x+2y=144$
$2(12+y)+2y=144$
$24+2y+2y=144$
$4y=120$
$4y/4=120/4$
$y=30$
$x=12+y$
$x=12+30$
$x=42$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 4 - Section 4.4 - Systems of Linear Equations and Problem Solving - Exercise Set - Page 322: 45
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