y\;=\; \frac{ 1 }{2 }x 

A = (2, 3)
b = Line(A, Δ)
B = Point(b)
u = Vector(A, B)
M_0 = Point(Δ)
M = Point(Δ)
v = Vector(M_0, M)
c = OrthogonalLine(M_0, xAxis)
d = OrthogonalLine(M, xAxis)
C = Intersect(c, xAxis)
D = Intersect(d, xAxis)
e = Segment(M_0, C)
f = Segment(M, D)