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The simplest form of regression in Python is, well, simple linear regression. With simple linear regression, you're trying to ...
Linear equations can be shown on a graph. Find out how to create one in this Bitesize KS3 maths video.
Microsoft Excel can generate trend lines based on data you provide, and in doing do, calculates the equation of the trend line. This equation can be accessed using Excel's built-in Visual Basic tools.