Elementary Algebra

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: 56

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}
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