Question: how to calculate the slope of a trendline in excel?
Answer: Examine the equation for the line, which Excel is now displaying overlaid on the scatter plot. The equation will be in the form of "y = mx + b" where m and b will be numbers. The value of "m" is the slope of the graph. For example, if the equation is y = 5.2x + 7, the slope is 5.2.