A line of best fit is a straight line that most closely represents the relationship between two sets of data. It is used to predict the value of one variable based on the value of another variable. In Excel, you can create a line of best fit using the “LINEST” function.
The LINEST function takes an array of x-values and an array of y-values as input, and returns an array of coefficients that describe the line of best fit. The first coefficient is the slope of the line, and the second coefficient is the y-intercept.