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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.
Points: (x, y) and (x, y) Slope: y1-y2/x1-x2
You can use the formula: y=mx+b (berdill)