Determine the point of intersection of the three planes 1: X+ 3y-z+9=0 2X-y+2- 11 =0 73: [x, y, z] = [1, 0, 1] + s[2, 1, -1] + #[4, 0, -1]. a. (1, -4, 3) C. (5, -4, 2) b. (5, 0, -5) d. (5, 1 1, -12)