Answer
$40$
Work Step by Step
Substituting $
x=4
$ and $
y=-4
,$ the given expression, $
5(x-y)-9(x+y)
,$ evaluates to
\begin{array}{l}\require{cancel}
5(4-(-4))-9(4+(-4))
\\\\=
5(4+4)-9(4-4)
\\\\=
5(8)-9(0)
\\\\=
40-0
\\\\=
40
.\end{array}
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 - 1.5 - Use of Properties - Problem Set 1.5 - Page 34: 72
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