Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 10 - Review Exercises - Page 760: 12


$x=-38, y=8, z=-2$

Work Step by Step

Write the system of equations corresponding to the augmented matrix as follows: $x+3y-9z=4 \\ y-z =10 \\ z=-2$ Substitute the value of $z=-2$ in $y-z=10$ we get: $y+2=10 \implies y=8$ Now, $x+3(8)-9(-2)=4 \implies x=-38$ Therefore, $x=-38, y=8, z=-2$
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