Tolong kerjakan no. 2 abc... mksh

a. (y2 - y1) = m(x2 - x1)
6 - 1 = m(4 - 1)
5 = 3m
m = 5/3

b. 1 - 4 = m(3 - (-2))
-3 = 5m
m = -3/5

c. 0 = 7m
m = 0