If the lines represented by the equation $px^2 - qy^2 = 0$ are distinct,then:

If the slope of one of the two lines represented by the equation $\frac{x^2}{a} + \frac{2xy}{h} + \frac{y^2}{b} = 0$ is twice that of the other, then find the ratio $h^2 : ab$.

The lines represented by the equation $x^2-y^2-x+3y-2=0$ are :

The product of the perpendicular distances drawn from the origin to the pair of straight lines $6x^2 - 5xy - 6y^2 + x + 5y - 1 = 0$ is

Two of the lines represented by the equation $a y^4+b x y^3+c x^2 y^2+d x^3 y+e x^4=0$ will be perpendicular,then

If the equation $kxy + 5x + 3y + 2 = 0$ represents a pair of lines,then $k=$