For a negative slope, the rise is negative and the run is positive.
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the change of rise over run. a positive slope goes up and a negative slope goes down
The rise is the difference in y coordinates for a line and the run is the difference in x coordinates. For a negative slope, the rise is negative and the run is positive.The slope is the "rise over the run", dividing the y difference by the x difference. The formula is :.Y2- Y1. _____.X2 -X1
Whether both are positive or not, you divide rise / run.
It all depends on the slope, really. Because remember that the formula for calculating slope is rise over run.