5. Find a plane perpendicular to x + 3y - 6z = 1 and containing the line of intersection of the planes xy+3z = 5 and 2x + y + z = 10. 6. Find a plane passing through the point (1,3,0) and containing the line of intersection of the planes xyz = 10 and 4x + y +2z = 3. 7. Find the equation of the plane containing the lines and x=-3t, y=2+t, z= -4+t x=-5-s, y=4+ s/2, z=-1+s.