Points: (x, y) and (x, y)
Slope: y1-y2/x1-x2
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Calculate slope as slope=(y2-y1)/(t2-t1).
If an x-t graph is a position-time graph, velocity is the slope of the line on the graph.
If you graph distance vs. time, the slope of the line will be the average speed.
You can use the formula: y=mx+b (berdill)
Slope = change in y (distance) / change in x (time). If the graph is not a straight line then either apply the above formula to the tangent at the point of interest or differentiate the equation of the graph.