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
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
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 - Page 300: 2
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