Calculate slope as slope=(y2-y1)/(t2-t1).
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If an x-t graph is a position-time graph, velocity is the slope of the line on the graph.
It is the average velocity.
The slope of a line on a position vs. time graph would represent the a velocity of the object being described.
If you graph distance vs. time, the slope of the line will be the average speed.
A straight line with a positive slope on a position-time graph is the graph of an object that's moving in a straight line with constant speed.