# Graphing 11 - Formula for slope

Taught by YourMathGal
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Part of video series
Meets NCTM Standards:
Errors in this video:

There is an error, which is corrected, around the 7 1/2 minute mark where the slope should be positive 3/4.

Lesson Summary:

This lesson covers the formula for finding the slope of a line passing through two points using algebra, rather than relying on graphing and counting. The formula involves subtracting the y-coordinates of each point and dividing the difference by the x-coordinate difference. The order of the points used in the formula doesn't matter, and the result is a numerical representation of the slant of the line. The video provides examples of using the formula and offers further practice in the next lesson.

Lesson Description:

Covers the algebraic formula used to find the slope of a line passing through two points. More examples are in the next video, Graphing 12. This is part 11 of a series of videos about graphing lines.

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com

Questions answered by this video:
• How do you find the slope between two points by graphing them and using rise/run?
• How do you find the slope between (-3, 2) and (2, -1)?
• What is the formula for finding slope between two points?
• Does it matter what order you subtract the coordinates when finding slope?
• Does it matter which point is which when calculating (y2 - y1)/(x2 - x1)?
• How do you find the slope of the line passing through (4, -6) and (8, -3)?
• #### Staff Review

• Currently 4.0/5 Stars.
In this video, you will learn how to find the slope of a line if you only have two ordered pairs or points. This time, it is not necessary to use a graph. Finding slope by using the formula for slope between two points is shown and used.