Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 6 - Systems of Equations and Inequalities - Mid-Chapter Quiz - Page 389: 18



Work Step by Step

The second equation can easily be modified to have only the $y$ on the left side of the equal sign. Thus, The respective value for $y$ ($7x+9$) can be substituted for $y$ in the first equation.
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