Answer
$-\frac{4}{5}$
Work Step by Step
$\frac{-3-9}{8-(-7)}=\frac{-12}{8+7}=\frac{-12}{15}=-\frac{12}{15}$
$=-\frac{\frac{12}{3}}{\frac{15}{3}}=-\frac{4}{5}$
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 3 - Graphing Linear Functions - 3.4 - Graphing Linear Equations in Standard Form - Exercises - Page 134: 41
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