I guess I don't quite understand regression lines?

I guess I don't quite understand regression lines?
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Answer :

Without seeing how you set up your regressions it’s hard to answer but did you select the appropriate regression type for your data set? Linear, exponential etc… Linear is not always the one to use and you just kind of need to know how the system you are modeling reacts to input—try polynomial and increase the order of magnitude until it closely matches your data—if you have a data point that is an outlier and can be eliminated that can help too.
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