This tutorial explains how to find a line that best fits a curve in Excel, including several examples.
Curve Fitting in Excel - EngineerExcel
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Curve Fitting Made easy in Excel: Fit line, polynomial, log, power
Curve-fitting data in Excel is easier than you think!
Using Excel to find best-fit curves
Curve-fitting data in Excel is easier than you think!
Using Excel to find best-fit curves
AppendixA
Curve fitting in Excel - Excelchat
Curve Fitting in Excel - EngineerExcel
Advanced Curve Fitting using Excel and NMath - CenterSpace