The rise refers to the change in the y axis
The run refers to the change in the x axis
rise = y2 - y1
run = x2 - x1
From the graph,
when x = 0, y = 1. thus, x1 = 0 and y1 = 1
when x = 0, y = 1. thus, x1 = 0 and y1 = 1
when x = 1, y = 3. thus, x2 = 1 and y2 = 3
Slope, m = (3 - 1)/(1 - 0)
m = 2/1
m = 2