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the rate of change on the line.
velocity
If the line slants up and to the right, it has a positive slope. If it is slanting up and to the left, it has a negative slope.
1. You can tell the difference because the proportional one has the same slope while the inversely one has opposite reciprocal slope.
It tells you that the speed of the object is not changing. The speed is represented by the slope in a distance vs. time graph, if slope doesn't change, speed doesn't.