What's my line, anyway? A video covers the aspects of finding an equation of the best-fit line for a set of data. It works through plotting the points to drawing a line that appears to represent the data. The presenter suggests finding the point-slope form of the line, since it is the easiest to find, and then rewriting it into slope-intercept form.

Concepts

scatter plots, line of best fit, slope-intercept form, point-slope form, linear equations, linear equations writing, data representations, bivariate data

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Additional Tags

math

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Instructional Ideas

• Have the class collect bivariate data from any other source and construct a scatter plot to determine the equation of a best fit line

Classroom Considerations

• The video mentions that the best-fit line must go through at least two data points; this is not necessarily the case

• This video is hosted on YouTube

Pros

• The beginning is a review of scatter plots and the association of data
• Examples use numbers that do not come out pretty, which is typical for real-world problems

Cons

• None

Common Core

HSS-ID.B.6.a