f(x) = 10^x

A (0/10000)

C (4/0)

f = Function(10.0^(x), -20.0, 20.0)
A = Point(yAxis)
a = OrthogonalLine(A, yAxis)
B = Intersect(f, a, (4.0, 10000.0))
b = OrthogonalLine(B, xAxis)
C = Intersect(b, xAxis)