Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Appendix E - Exercise Set: 35

Answer

$x = 5$

Work Step by Step

The determinant is: $D = 1 \times 7 - x \times 2$ and we know that $D=-3$ Therefore $1 \times 7 - x \times 2 = -3$ $7 - 2x = -3$ $-2x = -10$ $x = 5$
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