your eye and ears
why? because with sight you can see where your going and with ears you can hear what is happening around or if something is coming you can hear it.
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For a negative slope, the rise is negative and the run is positive.
slope = rise divided by run
Your answer is 3/24 or 0.125 Slope = Rise / Run
The run of a slope is the difference between x-coordinates (delta x or x2 - x1 ).
slope of line is the ration of the rise over the run