Pair of Lines question bank (Mathematics)

If the equation $x^{2}-3 x y+\lambda y^{2}+3 x-5 y+2=0$ represents a pair of lines, where $\lambda$ is real number and $\theta$ is angle between them, then value of $\operatorname{cosec}^{2} \theta$ is

The line $5x+y-1=0$ coincides with one of the lines given by $5x^2+xy-kx-2y+2=0$ then the value of $k$ is