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

If one of the lines represented by the equation $ax^2 + 2hxy + by^2 = 0$ is $y = mx$,then

If the equation $ax^{2} + by^{2} + cx + cy = 0$,$c \neq 0$ represents a pair of lines,then

The equation of the image of the pair of lines $y = |x - 1|$ in the $y$-axis is:

The combined equation of the lines passing through the origin and having slopes $\frac{2}{3}$ and $-\frac{2}{3}$ is

If $m_{1}$ and $m_{2}$ are slopes of the lines represented by $(\sec^{2} \theta - \sin^{2} \theta) x^{2} - 2 \tan \theta xy + \sin^{2} \theta y^{2} = 0$,then $|m_{1} - m_{2}| = $