## Elementary Algebra

Published by Cengage Learning

# Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.5 - Use of Properties - Problem Set 1.5: 75

#### Answer

$180$

#### Work Step by Step

Combining like terms, the given expression, $5x-9xy+3x+2xy ,$ simplifies to \begin{array}{l}\require{cancel} (5x+3x)+(-9xy+2xy) \\\\= 8x-7xy .\end{array} Substituting $x=12$ and $y=-1 ,$ the resulting expression above evaluates to \begin{array}{l}\require{cancel} 8(12)-7(12)(-1) \\\\= 96+84 \\\\= 180 .\end{array}

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