Answer:
Line 1: -2
Line 2: 2
Line 3: 2
Line 1 & 2 is parallel.
Line 2 & 3 is neither.
Explanation:
To find the slope of a line use the slope formula and substitute the points into it:
Line 1

Line 2

Line 3

Parallel lines have the same slope and perpendicular lines have negative reciprocal slopes.
Line 1 & 2 is parallel.
Line 2 & 3 is neither.