7 Given the line L x y z 1 0 1 t 1 1 1 the plane P 2x y 2z 7 and the point Q 2 0 1 J X t y ter a Find the distance between the line and the X axis b Find the point A on the plane P which is closest to the point Q c Find parametric equations of the line which intersects both the X axis and the line L at a right angle