Respuesta :

WillieH
Slope is 

S = y2-y1/x2-x1

x1 = -3 and y1 = -8
x2 = -12 and y2 = -20

Substitute
S = -20 - (-8)/-12 - (-3)

Simplify
S = -20 + 8/-12 + 3
Simplify
S = -12/-9
S = 4/3 
the equation for this is    2ndY - 1stY         yours is     -20 -  (-8)
                                        _________                          ---------------
                                         2ndX - 1stX                          -12 - (-3)

-16
____        simplifs to 16 over 9
 -9