Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter R - Section R.4 - Properties of Real Numbers - R.4 Exercises - Page 38: 50



Work Step by Step

The inverse property of multiplication holds that $a\times\frac{1}{a}=1$ (for some real number $a$). Therefore, $-\frac{9}{8}(-\frac{8}{9})=-\frac{9}{8}\times-\frac{8}{9}=\frac{9\times8}{8\times9}=\frac{72}{72}=1$.
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