Answer
$y=4$
Work Step by Step
Given:
$-2x-21y=-94$
$x+4y=21$
Add Equation 1 to 2 times Equation 2:
$-2x-21y=-94$
$2x+8y=42$
_______________________
$-13y=-52$
$y=4$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 3 Linear Systems and Matrices - Standardized Test Practice - Gridded Answer - Page 231: 11
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