The slope of a line is the ratio of
its rise to its run. The rise is the vertical change between two points on a line. The difference between the ycoordinates creates the rise. In this example, the difference between the ycoordinates of points A and B is 3  (3) = 6. The run is the horizontal difference between two points or the difference between the xcoordinates. In this example the difference is 3  1 = 4. 

In this example, the slope of the line is . 
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