Hi New Question

4y+6z=-2x-13
5y+2z=-13
y+2=0

Could u show me how to do this one?
Thank u

work out y from the 3rd equation, then put this value into the second equation to get x, then put in these 2 values to the first equation to get z.

These aren't really systems of equations, since there is only one unknown in each case.