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