Question 41504
1) x + y = -4 
2)4x + y = -13 
3)y + 3z = -10 

1) y=-4-x
2) 4x+(-4-x)=-13
  3x=-9
   x=-3
Then from 1) y=-4-x
             y=-4+3=-1

3) -1+3z=-10
      3z=-9
       z=-3

So, x=-3, y=-1, z=-3

Cheers,
Stan H.