Respuesta :

gil1979
15-9= 6
12-9= 3

6/3= 2
olemakpadu
Slope = Change in y / Change in x

Between (9, 9) and (12, 15).

We would use the coordinates from the second point minus that from the first point.

1st point = (9, 9),  2nd point = (12, 15)

Slope =  (15 - 9) / (12 - 9) 

         =  6 / 3

         =  2 

Slope = 2