Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.3 - Integers: Addition and Subtraction - Problem Set 1.3 - Page 20: 94



Work Step by Step

RECALL: $a+(-b)=a-b$ Substitute the given values of the variables to obtain: $x-y+z = 5-6+(-9)$ Use the rule above to obtain: $=5+(-6)+(-9)$ Combine the negative numbers to obtain: $=5 + (-15)$ Add to obtain: $=-10$
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