" The planes "ax+4y+z=0,2y+3z-1=0,3x-beta z+2=0

The planes ax+4y+z=0,2y+3z-1=0 and 3x-bz+2=0 will

The planes ax+4y+z=0,2y+3z-1=0 and 3x-bz+2=0 will

Which one of following is correct ? The three planes 2x+3y-z-2=0, 3x+3y+z-4=0,x-y+2z-5=0 intersect

The direction of the line of intersection of the planes 2x + 3y + z-1 = 0 and x+y-z-7 = 0 is ..............