Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 3 Linear Systems and Matrices - 3.4 Solve Systems of Linear Equations in Three Variables - 3.4 Exercises - Skill Practice - Page 182: 22

Answer

See below.

Work Step by Step

He forgot to multiply the coefficient of $y$ and $x$ in the first equation by $-1$ when putting them on the other side of the equation.
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