Question: what is the equation used to calculate a linear trendline?
Answer: The general formula for a line is y=mx+b, for which m is the slope, b is the y-intercept, x is any x value and y is any y value. By looking at the equation of the trend line, you can determine the y-intercept. For example, if the equation of the trend line is y=2x+5, the y-intercept is 5.