B: (6, 0, 0)
A: (0, 0, 8)
C: (6, 3, 0)
a = Plane(A, B, C)
P: (2, 1, 0)
Q: (3, 2, 3)
f = Line(Q, P)
D = Intersect(f, xOyPlane)
E = Intersect(f, a)