Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 9 - Basic Algebra - Review Exercises: 119



Work Step by Step

The numbers 3 and 9 have a least common multiple of 9. Therefore, we can rewrite both fractions with a denominator of 9. $-\frac{2}{3}+\frac{1}{9}=-\frac{2\times3}{3\times3}+\frac{1}{9}=-\frac{6}{9}+\frac{1}{9}=\frac{-6+1}{9}=-\frac{5}{9}$
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