V(3,3) F(6,3)
V(0,0) F(0,-4)
V(1,3) F(1, 5)
V(0,0) F(-3,0)
V(-2,3) F(-5,3)
(y-3)^2=12(x-3)
y^2= -12x
(x-1)^2=8(y-3)
(y-3)^2=-12(x+2)
x^2= -16y
