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# Video:How to Find the Slope of a Line

with Deb Russell

Want to learn how to find the slope of a line? Here, see helpful tips and tricks that will make it easy to do on your own.See Transcript

## Transcript:How to Find the Slope of a Line

When the slope of the line is 0, you know that the line is horizontal and you know it's a vertical line when the slope of a line is undefined. So, how do you calculate the slope of a line?

### Instructions for How to Find the Slope of a Line

In the Figure below, the subscripts on point A, B and C indicate the fact that there are three points on the line. The change in y whether up or down is divided by the change in x going to the right, this is the 'rise over run' concept.

### Equation for Finding the Slope of a Line

y = mx + b is the equation that represents the line and the slope of the line with respect to the x-axis which is given by tan  (read as tan theta) = m. This is the slope-intercept form of the equation of a line. When the slope passes through a point A(x1, y1) then y1 = mx1 + b or with subtraction y - y1 = m (x - x1) You now have the slope-point form of the equation of a line.