Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 4 - Section 4.2 - Solving Systems of Linear Equations by Substitution - Exercise Set: 2

Answer

y = 5 x = 15

Work Step by Step

x + y = 20; x = 3y Substitute x for 3y to the first equation. 3y + y = 20 4y = 20 y = 5 (Divide both sides by 4) Substitute y = 5 to the second equation. x = 3 $\times$ 5 x = 15
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