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 - Quiz for Lessons 3.6-3.8 - Page 217: 9

Answer

$x=3, y=1$

Work Step by Step

Rewrite our system of equations in matrix form: $\begin{bmatrix} 3 & -4\\ 2 & -3 \end{bmatrix}.\begin{bmatrix} x\\ y \end{bmatrix}=\begin{bmatrix} 5\\ 3 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=\frac{1}{-9+8}\begin{bmatrix} -3&4\\ -2 & 3 \end{bmatrix}.\begin{bmatrix} 5\\ 3 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=-1\begin{bmatrix} -3\\ -1 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=\begin{bmatrix} 3\\ 1 \end{bmatrix}$ Hence, $x=3, y=1$
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