Rise/run
or
y-value change (can be negative) / x-value change (can be negative)
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Slope of the line
Slope.
it is called the slope
If the line has a slope of 2, then the perpendicular line has a slope of -1/2. The slope of a perpendicular line is the negative reciprocal. Another example would be if the slope of a line is -1/4, then the slope of the perpendicular is 4.
if the slope of a line is 2/3, then the slope of a parallel line would be 2/3.