O: (0, 0)
A = (3, 1)
f = Line(A, O)
B = (1, 2)
g = Line(O, B)
u = Vector(O, A)
v = Vector(O, B)
x' = 2.903 (slider from -3 to 3, step 0.001)
y': x'^(2)
M: (x' * u) + (y' * v)