A = Intersect(xAxis, yAxis)
B = (-60, -30)
u = Vector(A, B)
C = (40, 60)
v = Vector(A, C)
a = Line(B, v)
b = Line(C, u)
D = Intersect(a, b)
w = Vector(A, D)
c = Segment(B, D)
d = Segment(C, D)