Answer
$16$
Work Step by Step
RECALL:
$a-(-b)=a+b$
Substitute the given values of the variables to obtain:
$-x-y = -(-7)-(-9)=7-(-9)$
Use the rule above to obtain:
$=7+9
\\=16$
Elementary Algebra
by Kaufmann, Jerome; Schwitters, Karen;
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: 92
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