Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 9 - Systems and Matrices - 9.2 Matrix Solution of Linear Systems - 9.2 Exercises: 8

Answer

$\left[\begin{array}{ll} 1 & -4\\ 0 & 28 \end{array}\right]$

Work Step by Step

$\left[\begin{array}{ll} 1 & -4\\ 7+1(-7) & 0+(-4)(-7) \end{array}\right]=\left[\begin{array}{ll} 1 & -4\\ 0 & 28 \end{array}\right]$
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