Big Ideas Math - Algebra 1, A Common Core Curriculum

Published by Big Ideas Learning LLC
ISBN 10: 978-1-60840-838-2
ISBN 13: 978-1-60840-838-2

Chapter 1 - Solving Linear Equations - Maintaining Mathematical Proficiency - Page 1: 6

Answer

$2$

Work Step by Step

The subtrahend is negative so replace $\color{blue}{-(-7)}$ with $\color{red}{+7}$ to obtain: $-5\color{blue}{-(-7)}=-5\color{red}{+7}$ Since $|7|>|-5|$, subtract $|-5|$ from $|7|$, then copy the sign of $7$ to obtain: $\begin{align*} -5+7&=|7|-|-5|\\ &=7-5\\ &=2 \end{align*}$
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