You can determine one variable from the other at any given point for that motion, and differentiating the graph gives you the speed at any selected point.
You can do this without the plot itself but a graph shows the relationship clearly and immediately.
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distance time graph is a graph traveled in a graph which shows how much we have traveled in equal period of time.
The slope of a distance-time graph represents speed.
Typically distance is plotted on the y-axis of a distance-time graph.
speed is the gradient under the distance vs time graph which is change in distance /change in time
A straight line on a distance - time graph represents a "constant velocity".