To find the slope of a line:
-- pick 2 points on the line
-- find the change in 'y' as the line goes from one point to the other
-- find the change in 'x' as the line goes from one point to the other
-- divide (the change in y) by (the change in x).
-- the quotient is the slope.
This is exactly the fraction in the picture, starting with "m = ".
For the line in the picture, let's take the starting point and the ending point.
-- the change in 'y' from beginning to end is 20 meters .
-- the change in 'x' from beginning to end is 5 seconds .
-- The slope is
(20 meters) divided by (5 seconds)
= (20 / 5) (meters/seconds)
= 4 meters per second .
