#### Answer

We can verify the equations by substituting in the given $x$, $y$ and $z$ values and then check if the equalities still hold.
Here:
$4x-z=4(2)-1=8-1=7$, which is correct.
$8x+5y-z=8(2)+5(-3)-1=16-15-1=0$, which is correct.
$-x-y+5z=-2-(-3)+5(1)=-2+3+5=6$, which is correct.