f(x) = (2 * x) + 3
g(x) = (2 * x) - 3
A = Intersect(f, yAxis, 1)
B = Intersect(g, yAxis, 1)
C = Intersect(f, xAxis, 1)
D = Intersect(g, xAxis, 1)
E = Intersect(xAxis, yAxis)
u = Vector(E, A)
v = Vector(E, B)