Three planes:

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

They intersect at: (a) (-2/5,5,9/5) (b) no common intersection (c) r=(5/3,-2/3,0)+&(1,5,3) (d) r=(0,-4,-5)+%(1,5,3)
&/%=signs like alpha and beta, used in vector eqns

Please help! I just can't get the answer to be/ressemble any of them!