Graphs are used all over the field of physics, and the p-t and v-t graphs are the ones used most for moving objects, especially when describing the projectile motion of objects. With one peek at the graph, you can tell a lot about what's going on, which is one reason they are so useful. You don't have to pour over pages of equations to get a sense of what's going on with the experiment.
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I am not sure what you are referring to. You plot each time and distance set on the graph and then look for a trend (line).
what should you do for more than two distances and times?