The equation `x^2y^2-9y^2+6x^2y+54 y=0` represents a pair of straight lines and a circle a pair of straight lines and a parabola a set of four straight lines forming a square none of these

The equation x^2y^2-9y^2-6x^2y+54 y=0 represents (a) a pair of straight lines and a circle (b) a pair of straight lines and a parabola (c) a set of four straight lines forming a square (d) none of these

The equation x^(2)y^(2)-9y^(2)-6x^(2)y+54y=0 represents

If the equation kx^(2) – 2xy - y^(2)– 2x + 2y = 0 represents a pair of lines, then k =

x^2-x y+y^2-4x-4y+16=0 represents a. a point b. a circle c. a pair of straight line d. none of these

Show that 4x^(2)+4xy+y^(2)-6x-3y-4=0 represents a pair of parallel lines.

The equation a^2x^2+2h(a+b)x y+b^2y^2=0 and a x^2+2h x y+b y^2=0 represent (a)two pairs of perpendicular straight lines (b)two pairs of parallel straight lines (c)two pairs of straight lines which are equally inclined to each other (d)none of these

Show that 3x^2+10xy+8y^2+14x+22y+15=0 represents a pair of straight lines and the angle between them is tan^(-1)(2/11) .