9. The points AI '1, 1,1|, 3| 2, ID. 3], and C[3, 3, 4|. Show that this triangle is a right-angle triangle. [3] 1|]. Determine the following: a] Determine the vector equation of the plane that contains the following two lines L1: 1" = (2,3.S) + t(3.1, 5}. rd? [2] L2: 1" : (13,5) + 5wJ 4-, 3),SR b] Determine the corresponding Cartesian equation. [5]