Answer
$44$
Work Step by Step
Substituting $
x=-1
$ and $
y=-4
,$ the given expression, $
5x-7y-9x-3y
,$ evaluates to
\begin{array}{l}\require{cancel}
5(-1)-7(-4)-9(-1)-3(-4)
\\\\=
-5+28+9+12
\\\\=
23+9+12
\\\\=
32+12
\\\\=
44
.\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: 64
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