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 Review - Page 226: 35

Answer

$x=-1, y=-4$

Work Step by Step

Write the linear system as a matrix equation $AX = B$. $\begin{bmatrix} 3 & 2\\ 4&-3 \end{bmatrix}\begin{bmatrix} x\\ y \end{bmatrix}=\begin{bmatrix} -11\\ 8 \end{bmatrix}$ Then $\begin{bmatrix} x\\ y \end{bmatrix}=\frac{1}{-9-8}\begin{bmatrix} -3 & -2\\ -4 &3 \end{bmatrix}\begin{bmatrix} -11\\ 8 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=\frac{-1}{17}\begin{bmatrix} 17\\ 68 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=\begin{bmatrix} -1\\ -4 \end{bmatrix}$ Hence, $x=-1, y=-4$
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