9. [0.5/1 Points] DETAILS PREVIOUS ANSWERS SCALC9 12.5.057. MY NOTES PRACTICE ANOTHER Consider the following planes. X+y+z=9, X+4y+4z=9 (a) Find parametric equations for the line of intersection of the planes. (Use the parameter t.) .v=( 9. t.t 2 ) (b) Find the angle between the planes. (Round your answer to one decimal place.) x Need Help? Submit Answer 10. [0/1 Points] DETAILS PREVIOUS ANSWERS SCALCB 12.5.065. MY NOTES PRACTICE ANOTHER Find parametric equations for the line through the point (0, Z, 2) that is parallel to the plane x + y + z = 5 and perpendicular to the line x = 1 + t, y = 2 t, z = 2t. (Use the parameter E.) k 2k 21. (x(t>.y(r>.z(r))=( _y@' M?" J? x ) Need Help? __