In Excel you can add a trendline to your chart to show visual data trends. Learn how to add trendline formulas and equations in Excel in this video tutorial from Microsoft.

1. Select a chart.

2. Select the + to the top right of the chart.

3. Select Trendline.

Note: Excel displays the Trendline option only if you select a chart that has more than one data series without selecting a data series.

4. In the Add Trendline dialog box, select any data series options you want, and click OK.