Use the sliders on the interactive to determine the shape
 of the conic when A and C equal specific values.
 AR+ Cy? +x+y - 9 = 0
 A= 1, C = 5, Conic Type:
 A=-2, C = 4, Conic Type:
 A=0, C=-1.5. Conic Type:
 A=0.5, C = -2, Conic Type:
 A = -3.5, C =-3.5. Conic Type: