Answer
$r=-4$
Work Step by Step
Step 1. Subtract 9 from both sides of the equation.
$2.5r+9-9=-1-9$
$2.5r=-10$
Step 2. Divide both sides by 2.5.
$\frac{2.5r}{2.5}=\frac{-10}{2.5}$
$r=-4$
Basic College Mathematics (9th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0321825535
ISBN 13:
978-0-32182-553-7
Chapter 9 - Basic Algebra - 9.7 Solving Equations with Several Steps - 9.7 Exercises - Page 680: 59
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