Answer
$x=-38, y=8, z=-2$
Work Step by Step
Write the system of equations corresponding to the augmented matrix as follows:
$x+3y-9z=4 \\ y-z =10 \\ z=-2$
Substitute the value of $z=-2$ in $y-z=10$
we get: $y+2=10 \implies y=8$
Now, $x+3(8)-9(-2)=4 \implies x=-38$
Therefore, $x=-38, y=8, z=-2$
