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 - 1.3 - Integers: Addition and Subtraction - Problem Set 1.3: 97

Answer

$= 9$

Work Step by Step

1. We first substitute the $x, y, and \space z$ values into the equation using parenthesis: $-x + y + z$ for $x = -11$, $y = 7$, $z = -9$ $= -(-11)+7 + (-9)$ 2. A double negative such as "$-(-11)$" will cancel out to become "$11$", a positive number while a positive and a negative number like "$+(-9)$" will become "$-9$", a negative number : $= 11 + 7 - 9$ $= 18 - 9$ $= 9$
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