Answer
$(-x)+(-y)=-x-y$
Work Step by Step
The opposites of two numbers can be translated as:
$-x$ and $-y$
The sum of these two is:
$(-x)+(-y)=-x-y$
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 1 - Introduction to Algebraic Expressions - 1.7 Multiplication and Division of Real Numbers - 1.7 Exercise Set - Page 59: 132
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