Answer
$$y=-1,\:x=2$$
Work Step by Step
Solving using the elimination method, we obtain:
$$ \begin{bmatrix}3x-y=7\\ x+y=1\end{bmatrix}\\ \begin{bmatrix}3x-y=7\\ 3x+3y=3\end{bmatrix}\\ \begin{bmatrix}3x-y=7\\ 4y=-4\end{bmatrix}\\ y=-1,\:x=2$$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 8 - Systems of Linear Equations and Problem Solving - Test: Chapter 8 - Page 572: 3
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