If you mean (5, 5) (7, 1) and (5, 5) (8, 4) then their slopes are -2 and -1/3 respectively which are negative or down hill lines.
The lines that pass through points 4 -6 2 -3 and 6 5 3 3 on a grid are the lines y=x.
They are intersecting lines.
They are intersecting lines.
They are both vertical lines.
Mutually perpendicular lines.
Parallel
neither
perpendicular
perpendicular
parallel
perpendicular
parrell