This is similar to Problem 7 from your Section 3.1 worksheet.

Solve the system of linear equations if possible.

\begin{cases} 3 x + 4 y - 5 z &= 10 \\ 5 y +2 z &= 38 \\ 9 z &= -9 \end{cases} $x=$
$y=$
$z=$

Hint: