Algebra 2 (1st Edition)

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

Chapter 5 Polynomials and Polynomial Functions - 5.1 Use Properties of Exponents - 5.1 Exercises - Mixed Review - Page 335: 63

Answer

$x=\frac{21}{13}, y=\frac{-2}{13} $

Work Step by Step

$A^{-1}=\begin{bmatrix} 4& 3\\ 6& -2 \end{bmatrix}^{-1}=\begin{bmatrix} -2&-3\\ -6 & 4 \end{bmatrix}$ The system can be written as: $\begin{bmatrix} 4 &3\\ 6& -2 \end{bmatrix}.\begin{bmatrix} x\\ y \end{bmatrix}=\begin{bmatrix} 6\\ 10 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=\frac{1}{-8-18}\begin{bmatrix} -2&-3\\ -6& 4 \end{bmatrix}.\begin{bmatrix} 6\\ 10 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=-\frac{1}{26}\begin{bmatrix} -42\\ 4 \end{bmatrix}$ $\begin{bmatrix} x\\ y \end{bmatrix}=\begin{bmatrix} \frac{21}{13}\\ \frac{-2}{13} \end{bmatrix}$ Hence, $x=\frac{21}{13}, y=\frac{-2}{13} $
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