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.
In this lesson, you'll learn how to find the slope between two points. Using the point slope formula, which states y2 minus y1 equals m times x2 minus x1, you'll discover how to plug in the values and label the x and y coordinates. Once this is done, you can find the value of m or the slope. The slope formula, which is much easier to use, states that m equals y2 minus y1 all over x2 minus x1. By simply plugging in the values and reducing, you can find the slope with ease.
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.