Algebra 2 (1st Edition)

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

Chapter 3 Linear Systems and Matrices - 3.8 Use Inverse Matrices to Solve Linear Systems - 3.8 Exercises - Skill Practice - Page 215: 26

Answer

$x=10, y=-8$

Work Step by Step

Rewrite our system of equations in matrix form: $\begin{bmatrix} 4 & 7\\ 2 & 3 \end{bmatrix}.\begin{bmatrix} x\\ y \end{bmatrix}=\begin{bmatrix} -16\\ -4 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=\frac{1}{12-14}\begin{bmatrix} 3 & -7\\ -2&4 \end{bmatrix}.\begin{bmatrix} -16\\ -4 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=\frac{-1}{2}\begin{bmatrix} -20\\ -48 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=\begin{bmatrix} 10\\ -8 \end{bmatrix}$ Hence, $x=10, y=-8$
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