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 - 6-4 Applications of Linear Systems - Practice and Problem-Solving Exercises - Page 391: 19

Answer

Using substitution is most apt because you are given the value of y in terms of x so you just need to substitute this in the first equation to get the value of x.

Work Step by Step

First, substitute 4x in the first equation and then solve for x. Next substitute the value of x in the second equation and find the value of y. This will lead to the solution.
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