## Elementary Linear Algebra 7th Edition

$x$ = 0, $y$ = 4, $z$ =-2
$x$ + $y$ + $z$ = 2 -$x$ + 3$y$ + 2$z$ = 8 4$x$ + $y$ = 4 $R_{1}$+$R_{2}$→$R_{2}$ $x$ + $y$ + $z$ = 2 4$y$ + 3$z$ = 10 4$x$ + $y$ = 4 -4$R_{1}$+$R_{3}$→$R_{3}$ $x$ + $y$ + $z$ = 2 4$y$ + 3$z$ = 10 -3$y$ - 4$z$ = -4 3$R_{2}$→$R_{2}$ 4$R_{3}$→$R_{3}$ $x$ + $y$ + $z$ = 2 12$y$ + 9$z$ = 30 -12$y$ - 16$z$ = -16 $R_{2}$+$R_{3}$→$R_{3}$ $x$ + $y$ + $z$ = 2 12$y$ + 9$z$ = 30 -7$z$ = -14 $z$ = -2, plug this value into (12$y$ + 9$z$ = 30) 12$y$ + 9(-2) = 30 $y$ = 4 $x$ + (4) + (-2) = 2 $x$ = 0