Answer
$-9$
Work Step by Step
Substituting $x=
-1
$ and $y=
1
$, the given expression, $
2xy+6+5xy-8
,$ evaluates to
\begin{array}{l}\require{cancel}
2(-1)(1)+6+5(-1)(1)-8
\\\\=
-2+6-5-8
\\\\=
4-5-8
\\\\=
-1-8
\\\\=
-9
.\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: 63
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