Answer
$-57$
Work Step by Step
Substituting $x=
-3
$ and $y=
4
$, the given expression, $
7x-9y
,$ evaluates to
\begin{array}{l}\require{cancel}
7(-3)-9(4)
\\\\=
-21-36
\\\\=
-57
.\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 - Chapter 1 Review Problem Set - Page 38: 56
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