Trend lines can be used as a predictive tool. They are derived from simple linear data sets and offer some guidance within a business context. A linear trendline usually shows that something is increasing or decreasing at a steady rate. Just a note of caution in business, select an appropriate range that correctly reflects the true trend. Short-term ranges could be misleading. From a predictive perspective, the R-squared value, indicates some level of reliance in terms of forecasting. The closer R-squared is to one, the greater the reliance as a predictive tool.