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 - 1.5 - Use of Properties - Problem Set 1.5: 64

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}
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