tolong dong please.....

Mapel : Matematika
Bab : Persamaan Garis Lurus

m = y2-y1/x2 - x1

1)
m = -2-2/1 + 3
m = -4/4
m = -1

2)
m = 2-5/-7-2
m = -3/-9
m = 3/9
m = 1/3

3)
m = -3 + 1/-4 - 4
m = -2/-8
m = 2/8
m = 1/4