Answer
See below.
Work Step by Step
He forgot to multiply $7$ by $-2$ in the first equation. The correct version would be: $-6x-4y=-14$. Then use that to solve the system.
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 - 3.2 Solve Linear Systems Algebraically - 3.2 Exercises - Skill Practice - Page 164: 27
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