Algebra and Trigonometry 10th Edition

by Larson, Ron

Published by Cengage Learning

ISBN 10: 9781337271172

ISBN 13: 978-1-33727-117-2

Chapter 10 - 10.1 - Matrices and Systems of Equations - 10.1 Exercises - Page 711: 61

Answer

x = -5 y = 6

Work Step by Step

$\begin{bmatrix} 3 & -2 & |-27\\ 1 & 3 & |13\\ \end{bmatrix}$ ~ $\begin{bmatrix} 3 & -2 & |-27\\ 0 & -11 & |-66\\ \end{bmatrix}$ Back-Substitution: -11y = -66 y = 6 3x - 2(6) = -27 3x - 12 = -27 x = -5 x = -5 y = 6

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