What is the slope of the line passing through the points (9, -7) and (3, -9)

m = 3

Step-by-step explanation:

Notice how x increases by 6 from 3 to 9.  6 is the 'rise.'

Simultaneously, y increases by 2 from -9 to -7.  2 is the 'run.'

The slope, m, is defined as m = rise / run.

Here, m = 6/2, or m = 3

3x-12

Step-by-step explanation:

m−5(m+3) +7m

m-5m-15+7m=3m-15

For m=x+1

3(x+1)-15=3x+3-15=3x-12