It is the average velocity.
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The slope of a line on a position vs. time graph would represent the a velocity of the object being described.
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.
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.
Simply put, a velocity time graph is velocity (m/s) in the Y coordinate and time (s) in the X and a position time graph is distance (m) in the Y coordinate and time (s) in the X if you where to find the slope of a tangent on a distance time graph, it would give you the velocity whereas the slope on a velocity time graph would give you the acceleration.