tell wheter the lines through the given points are parallel, perpendicular or neither.

a. Line 1: (2,-3), (-4, -6)
Line 2: (-3, 2), (2, -8)

b. Line 1: (-4, -5), (4, 1)
Line 2: ( 6, 10), (-3, -2)

c. Line 1: (0, -4), (-2, -8)
Line 2: (-1, 5), (1, 9)