Question

question in comments <33

Answer 1

0 I believe, because the lines run parallel

Answer 2

A good way to do this is, by making a small graph, and you aren't given many points, so it shouldn't be to hard to deduce the final solution :).

Here are a few tips I can think of right now that might help you, basically what kinds of lines there are.

Intersecting lines : One point of intersection, meaning one solution.
Parallel lines: No points of intersection (never touch), no solution.
Coincident lines: Infinite points, infinite solutions.

Here, I'll draw a diagram out for you on the kinds of lines I just mentioned.