I am studying for my math final and our prof gave us a review but with no solutions... I am totally lost for this problem... We didn't even cover these types of problems in class so I don't know if I'll need to know how to do it but right now I have no clue. If anyone could help I would appreciate it.
Question: Show that the cone $z^2=ax^2 +by^2$ is a ruled surface.
I understand that a ruled surface is a surface composed of straight lines but that is as far as my knowledge goes for this question... Again any help is appreciated.