Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 6 - Systems of Equations and Inequalities - 6-2 Solving Systems Using Substitution - Lesson Check: 7

Answer

First Equation

Work Step by Step

The first equation contains a variable with no coefficient in front of it. That means that we can easily isolate a variable by adding 2x to both sides, making it the better equation to use.
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