Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 3 - Section 3.1 - Systems of Linear Equations in Two Variables - 3.1 Exercises: 40


$x=10$ $y=14$

Work Step by Step

The first equation is already solved for $y$, then we have to substitute this expression into the second equation: $y=1.4x$ Second equation: $0.5x+1.5(1.4x)=26.0$ $2.6x=26.0$ $x=10$ $y=1.4(10)=14$ We have to check, if the solution is right. Substitute $x$ with 10 and $y$ with 14: $14=1.4(10)$ $\checkmark$ $0.5(10)+1.5(14)=5+21=26.0$ $\checkmark$
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