Prove that the line through `A(0,1,1)` and `B(4,5,1)` intersects the line through `C(3,9,4)` and `D(4,4,4)` .

Prove that the lines through A(0,-1,-1) and B(4,5,1) intersecrs the line through C(3,9,2) and D(-4,4,4). Also,find their point of intersection.

Prove that the lines through A(0,-1,-1)a n dB(4,5,1) intersects the line through C(3,9,4)a n dD(-4,4,4)dot Also, find their point of intersection.

Prove that the lines through A(0,-1,-1)a n dB(4,5,1) intersecrs the line through C(3,9,2)a n dD(-4,4,4)dot Also, find their point of intersection.

Show that the line through P(3,9,4) and Q(-4,4,4)) intersect the line through R(0,-1,-1) and S(4,5,1) and find the point of intersection.

Show that the line through (4,7,8) and (2,3,4) is parallel to the line through the points (-1,-2,1) and (1,2,5).

Show that the line through (4,7,8), (2,3,4) is parallel to the line through the points (-1-2,1) and (1,2,5).

Show that the line through the point(4,7,8),(2,3,4)is parallel to the line through the points(-1,-2,1)and (1,2,5)

Show that the line through points (4,7,8) and 2,3,4 ) is parallel to the line through the points (-1,-2,1) and (1,2,5) .

Find the value of p for which the line through the points A(4,1,2) and B(5,p,0) is perpendicular to the line through the points C(2,1,1) and D(3,3,-1) .

Find the coordinates of the points where the line through (3,-4,-5) and (2,-3,1) crosses the plane,passing through the point (2,2,1)(3,0,1) and (4,-1,0).