- Slope descibes the steepness of lines.
- In coordinate geometry, slope normally refers to the slope of a line through 2 points.
- The slope of a line that is "uphill" from left to right is POSITIVE.
- The slope of a line that is "downhill" from left to right is NEGATIVE
- The slope of a line that is horizontal is zero.
- The slope of a line that is vertical is undefined.
- There is a BIG difference between a line with 0 slope (horizontal line) and a line with no slope (vertical line).
- The more positive (or the more negative) the numerical value of the slope, the steeper the line.
- Slope is the ratio of the change in y to the change in x.

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