D Question 8 1 pts Consider the plane (P) : 2x - y - kz = 1 and the point Q = (2, -1, -1). What is the value of k that will make the point Q lie on the plane (P)? D Question 9 1 pts Let the point P be the intersection of the plane 3x - 9y + 2z = 7 and the line r(t) = (1, 2, 1) + 1(-2, 0, 1). What is the x-coordinate of the point P