Show that the graph of an equation of the form 

Cy² + Dx + Ey + F  = 0, C ≠ 0,

(a) Is parabola if  D ≠ 0.

(b) Is a vertical line if D = 0 and E² - 4CF = 0.

(c) Is two vertical lines if D = 0 and E² - 4CF > 0.

(d) Contasin no points if D = 0 and E² - 4CF < 0.