Description
Specifies whether the intercept value will be used by the trendline.
This method only returns whether or not the trendline will use a pre-defined intercept value. To get or set the value of the intercept, use
Trendline.Intercept. Setting the value of the intercept will set this property to true. Clearing the value of the intercept with
Trendline.ClearIntercept() will set this property to false.
