3.9 = 4
4.2 = 4
5.5 = 6
6.3 = 6
Hopefully this is what you mean :)
None of these lines are parallel or perpendicular. I assume you may have mistyped the original equation. If the original equation had a 4 next to the x instead, then the following is true.
The first is parallel
The second is neither
The third is perpendicular.
