You can make a line graph in Excel in a matter of seconds using data already entered into the spreadsheet.

You can make a curved graph in Excel and Google Sheets using this tutorial. Learn how to convert sharp edges into smooth lines in a spreadsheet graph.

How to Have Three Secondary Axes on Excel 2007. Excel 2007's secondary axis feature enables you to view two different data series with two distinct scales, all on the same chart. Use this feature ...