Solving the systems:

1)
x-y+2z-w=-1
2x+y-2z-w=-2
-x+2y-4z+w=1
3x-3w=-3


2)
v+3w-2x=0
2u+v-4w+3x=0
2u+3v+2w-x=0
-4u-3v+5w-4x=0


They have a solution?