The angle between the lines $2 x=3 y=-z$ and $6 x=-y=-4 z$ is

The value of $k$ such that the line $\frac{x-4}{1}=\frac{y-2}{1}=\frac{z-k}{2}$ lies on the plane $2 x-4 y+z=7$ is

The locus represented by $x y+y z=0$ is