Question

Let a and b be non-zero real numbers. Then, the equation (ax² + by² + c) (x² – 5xy + 6y²) = 0 represents
(a) four straight lines, when c = 0 and a, b are of the same sign.
(b) two straight lines and a circle, when a = b, and c is of sign opposite to that of a
(c) two straight lines and a hyperbola, when a and b are of the same sign and c is of sign opposite to that of a
(d) a circle and an ellipse, when a and b are of the same sign and c is of sign opposite to that of a

Answer 1

1 is right I think so because