Algebra 1

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 - Practice and Problem-Solving Exercises - Page 371: 11



Work Step by Step

We know that y=3x. Thus, in the first equation, wherever we see y, we will substitute 3x, and then we will solve: $x+3x =8 \\\\ 4x =8 \\\\ x=2$ We now substitute x back in: y=3(2)=6 We plug (2,6) back into the first equation and confirm that our answer is, indeed, correct.
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