Show that the graph of an equation of the form 

Ax² + Dx + Ey + F  = 0, A ≠ 0,

(a) Is parabola if  E ≠ 0.

(b) Is a vertical line if E = 0 and D² - 4AF = 0.

(c) Is two vertical lines if E = 0 and D² - 4AF > 0.

(d) Contasin no points if E = 0 and D² - 4AF < 0.