I always have trouble showing the work on these. please help.?

Question

Are the following lines parallel, perpendicular, or neither?
L1 through (–4, –7) and (1, 3)
L2 through (2, 6) and (4, 10)

Answer 1

first calculate slopes of each line
slope of 1st line (1+4)/(3+7)
=5/10
=1/2
slope of second line (4-2)/(10-6)
=2/4
=1/2
as bothe slopes r equal these lines r parallel...
..

anywaz..two lines r peripendicular wen product of their slopes is -1(negative one)

Answer 2

find L1 and L2 ... in the form "y = ax + b"

compare "a" from L1 and L2 ...

if the "a's" are equal, then the lines are parallel

if a1 * a2 = (-1), then they are perpendicualr

otherwise they are neither