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Learn about slope, rate of change, and their applications in algebra through engaging lessons and examples on Khan Academy.

The slope of a line is rise over run. Learn how to calculate the slope of the line in a graph by finding the change in y and the change in x.

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When two points have the same y-value, it means they lie on a horizontal line. The slope of such a line is 0, and you will also find this by using the slope formula.

No, if the line is vertical then the slope is undefined. The slope is the measure of the rise (or change in the y-axis) over the run (or change in the x-axis). Since a vertical line has no change in x-axis, or …

Worked examples identifying the equations and slope of horizontal and vertical lines.

When two points have the same y-value, it means they lie on a horizontal line. The slope of such a line is 0, and you will also find this by using the slope formula.

On a velocity vs. time graph, the average acceleration for an interval is equal to the slope of the line connecting the endpoints of the interval. Concept check: On the velocity vs. time graph above, what …

The slope of line ℓ is 2 . A horizontal line has a slope of 0 since all points on the line have the same y -coordinate (so the change in y is 0 ). A vertical line has an undefined slope since all points on the line …