question as attached

20. (3C+4C)Consider the lines Li:x=2, y-2=3z and L2: x=y+k==+14 k (a) Explain why these lines can never be parallel, regardless of the value of k. (b) Determine the value of k that makes these two lines intersect at a single point, and find the actual point of intersection. 21. (4C) The point P(-1,0,1) is reflected in the plane y-z=0 and has P' as its image. Determine the coordinates of the point P'