## Elementary Linear Algebra 7th Edition

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