Here is a problem I don't quite know what to do with.

Solve the system of equations.

$\displaystyle 3x+4y+z=7$

$\displaystyle 2y+z=3$

$\displaystyle -5x+3y+8z=-31$

should I just solve for z by isolating it on one side of the equation like I would normally or is there a better method?