Question

Find the slope, if it exists, of the line containing the pair of points.

(-15,-14) and (-19,-20)

Answer 1

just insert each point into y = mx + b:

-14 = -15m + b
-20 =-19m + b


Isolate b:

b = 15m - 14
b = 19m - 20

Set b = b

15m - 14 = 19m - 20

Put like terms on the same side:

19m - 15m = 14 - 20

4m = -6
m = -6/4
m = -3/2

Answer 2

Alright, thanks.