Answer
The 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.
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 6 - Systems of Equations and Inequalities - 6-2 Solving Systems Using Substitution - Lesson Check - Page 371: 7
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