Elementary Linear Algebra 7th Edition

Published by Cengage Learning
ISBN 10: 1-13311-087-8
ISBN 13: 978-1-13311-087-3

Chapter 1 - Systems of Linear Equations - Review Exercises: 18

Answer

$x$ = -3 , $y$ = 7

Work Step by Step

3$y$ = 15 - 2$x$ $y$ = 5 -$\frac{2}{3}x$ $\frac{1}{3}x$ + $\frac{4}{7}$(5-$\frac{2}{3}x$) = 3 $\frac{1}{3}x$ + $\frac{20}{7}$ - $\frac{8}{21}x$ = 3 - $\frac{1}{21}x$ = $\frac{1}{7}$ $x$ = -3 $y$ = 5 - $\frac{2}{3}$(-3) $y$ = 5 + 2 $y$ = 7
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