slope(algebra 1)

i know that slope is rise over run, but how do i find the slope of a line with data points with a positive correlation that vary on the line? because there are points that the line doesn't go through. the data points represent number of heartbeats per second. what do i do?

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  1. Draw a triangle on the graph, the line contains the hypotenuse, draw one leg parallel to the vertical axis, one leg parallel with the horizontal axis.

    see this:

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