- - 9. Which of the following represents a direction vector for the plane π: 2x – 3y + 4z − 12 = 0 : a. d = (2,3,4) b. d(-2,3,4) c. d = (-3,2,3) d. d a = (2,4,-2) 10. By analyzing the normals, determine if the three planes: a. intersect in a line c. are coincident b. are parallel and distinct d. intersect at a point - П₁ x + 2y + 3z − 4 = 0 π2: 2x+4y+ 6z + 8 = 0 П3: 4x+8y + 12z − 10 = 0