The equation of one of the lines represented by the equation $pq(x^2 - y^2) + (p^2 - q^2)xy = 0$ is

If the slope of one of the lines given by $ax^2+2hxy+by^2=0$ is two times the other,then

If $4ab = 3h^2$,then the ratio of slopes of the lines represented by $ax^2 + 2hxy + by^2 = 0$ is

The locus of a point which moves such that its distance from the $x$-axis is twice its distance from the line $x-y=0$ is

If two sides of a triangle are represented by $x^2 - 7xy + 6y^2 = 0$ and the centroid is $(1, 0)$,then the equation of the third side is

The equation of the pair of straight lines passing through the point $(2,3)$ and perpendicular to the pair of lines $3x^2-4xy+5y^2=0$ is $ax^2+2hxy+by^2+2gx+2fy+c=0$. Then $a+b+c+f+g+h=$