AB is the run
AC is the rise
The slope of the line is -3/4
How the slope of the line is determined.
Let's consider two points on the line
use points (6,0) and (2,3)
The equation of a line is given by the formula
y = mx + b
where
m is slope
b is y-intercept
m = change in y/ change in x
m = 3 - 0/2-6
=>3/-4
slope of the line is -3/4
Using point (-6,9)
y - 9 = -3/4(x +6 )
y -9 = -3x/4 - 9/2
y = -3x/4 - 9/2 + 9
y = -3x/4 + 9/2
From the graph
AB is the run
AC is the rise