What is slope and how is it determine from a graph?

Pick two points on the line and determine their coordinates.Determine the difference in y-coordinates of these two points (rise).Determine the difference in x-coordinates for these two points (run).Divide the difference in y-coordinates by the difference in x-coordinates (rise/run or slope).

Slope is Y= mx + b
rise over runexample y= 3x+2 
the three