Answer
x=5; y=10
Work Step by Step
Multiplying the first equation by 5 and the second equation by 6/5 gives:
$2x+6y=70$
$\frac{72}{5}x-6y=12$
Adding two equations: $\frac{82}{5}x=82 \Rightarrow x=5$
Solve for y: $12(5)-5y=10 \Rightarrow y=10 $
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 5, Systems of Equations and Inequalities - Section 5.1 - Systems of Linear Equations in Two Variations - 5.1 Exercises - Page 447: 47
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