The slope of a line refers to how steep the line is. Given two points, (x1,y1) and (x2,y2), the slope can be found by this formula: (y2-y1) / (x2-x1). If the number is positive, the line goes up. If the slope is negative, the line goes down. If the slope is zero, the line is horizontal and if the slope is undefined because the denominator is 0, the line is vertical.
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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.
For two lines to be parallel they must have the same slope. A line parallel to a line with slope -2 would have a slope of -2.
The slope of a line measures the steepness of the line.
The slope is rise over run. If another line was parallel, the slope would be the same.