Question 6 (1 point) Determine a direction vector of the line of intersection of the two planes 2x + 2y+ 22- 12 =0 and 2x-y+z-1=0 . O A) [2, 2, 2] ( B) [2, - 1, 1] O C) [2, 0, -3] O D) [2, 1, -3] Question 7 (1 point) In three-space, find the intersection point of the two lines: [x, y, z] = [-1, 2, 0] + #13, -1, 4] and [x, y, z] = [-6, 8, -1] + s[2, -5, -3]. O A) ( -6, 8, - 1) O B ) ( - 4 , 3 , - 4 ) OC (3,2 1) O D) (- 1, 2, 0) Question 9 (1 point) If |21- 3, 1vl-4, and the angle between # and v is 35, find |z x 71. O A) 6.88 ( B) 12 O C) 12 O D) 9.83