## Introductory Algebra for College Students (7th Edition)

Published by Pearson

# Chapter 2 - Section 2.1 - The Addition Property of Equality - Exercise Set - Page 120: 48

r=7

#### Work Step by Step

13-3r+2+6r-2r-1=3+2$\times$9 First combine like terms (13+2-1)+(-3r+6r-2r)=3+2$\times$9 14+r=3+2$\times$9 Then multiply 14+r=3+18 Then subtract 14 from both sides r=3+18-14 r=21-14 r=7 Check the answer. 13-3(7)+2+6(7)-2(7)-1=3+2$\times$9 13-21+2+42-14-1=3+18 (-8)+2+42-14-1=21 (-6)+42-14-1=21 (36)-14-1=21 (22)-1=21 21=21

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