The slope of a line segment is the steepness of the line. It is the ratio of the rise (vertical) over the run (horizontal).
Horizontal lines have a slope of 0, and vertical lines have an undefined slope.
In math, slope is represented by the letter m.
Slope Formula: The slope of a line can be determined even without the graph as long as you have the two points and the slope formula. The formula is as follows:
Example: Determining the slope of points A (4,5) and B (2,1)