Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 4 - Section 4.1 - Solving Systems of Linear Equations in Two Variables - Exercise Set - Page 212: 15

Answer

Ordered pair solution $(2,8)$

Work Step by Step

We have $$(1) x+y=10$$ $$(2)y=4x$$ Substituting (2) in (1) $$x+4x = 10$$ $$5x=10$$ $$x=10\div5 = 2$$ Solving for $y$ $$y = 4*2 = 8$$ Ordered pair solution $(2,8)$
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