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slope
They indicate a rise in whatever it is that the graph is measuring.
Slope refers to the gradient of a graph, for linear graphs (straight-line) this is equal to the change in y divided by the change in x - often referred to as the 'rise over the run'.
In mathematical terms, the rise is how far a line goes up for a given distance. The run is how far a line goes along for a given distance. Rise and run is the angle of inclination or slope of a member or structure, expressed as the ratio of the vertical rise to the horizontal run.
The slope can be defined as rise over run. It is the degree at which a line goes up or down.