At about the 1:37 mark, the teacher gets a 3 for what is inside the parentheses; he should get a 4. Therefore, m=-3.
Given two points find the slope
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Questions answered by this video:
How do I find the slope of a line when I am given 2 points?
What is the slope of the line that has the two points (-1,4) and (3,-8)?
What is the slope of the line that has the two points (-2,5) and (-7,-10)?
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In this lesson, the teacher shows a couple ways to find the slope of a line when you are given two points that are on the line.