Answer
x = -3
y = 5
Work Step by Step
$\begin{bmatrix}
1 & 2 & |7\\
-1 & 1 & |8\\
\end{bmatrix}$ ~ $\begin{bmatrix}
1 & 2 & |7\\
0 & 3 & |15\\
\end{bmatrix}$
Back-Substitution:
3y = 15
y = 5
x + 2(5) = 7
x + 10 = 7
x = -3
x = -3
y = 5
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 10 - 10.1 - Matrices and Systems of Equations - 10.1 Exercises - Page 711: 59
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