Algebra 2 (1st Edition)

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

Chapter 3 Linear Systems and Matrices - Chapter Test - Page 227: 28

Answer

$x=-4, y=4$

Work Step by Step

Write the linear system as a matrix equation $AX = B$. $\begin{bmatrix} 2 & -7\\ 1&-3 \end{bmatrix}\begin{bmatrix} x\\ y \end{bmatrix}=\begin{bmatrix} -36\\ -16 \end{bmatrix}$ Then $\begin{bmatrix} x\\ y \end{bmatrix}=\frac{1}{-6+7}\begin{bmatrix} -3 & 7\\ -1 &2 \end{bmatrix}\begin{bmatrix} -36\\ -16 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=1\begin{bmatrix} -4\\ 4 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=\begin{bmatrix} -4\\ 4 \end{bmatrix}$ Hence, $x=-4, y=4$
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