Let L {\displaystyle \displaystyle L} be the line of intersection of the planes x + y + z = 6 {\displaystyle \displaystyle x+y+z=6} and x − y + 2 z = 0 {\displaystyle \displaystyle x-y+2z=0}
(a) Find the points in which the line L {\displaystyle \displaystyle L} intersects the coordinate planes.