plz help me answer it

4. Given the plane P: x - y + z = 2 and the line : x = 1 + t, y = 2t,z = 1 -t (t e R). a) Find the point on the line 2" which is closest to the origin. b) Find an equation of the plane which is perpendicular to the plane @ and contains the line 2. c) Find the distance between the line " and the Y-axis