A second y-axis in Excel allows you to plot two different sets of data on the same chart, each with its own y-axis. This can be useful when you want to compare data that is measured on different scales or has different units of measurement. For example, you could use a second y-axis to plot sales data and profit data on the same chart, even though the sales data is measured in dollars and the profit data is measured in percentage.
To add a second y-axis in Excel, first select the data that you want to plot on the second axis. Then, click on the “Insert” tab and select “Chart.” In the “Chart Type” dialog box, select the type of chart that you want to create. Then, click on the “Secondary Axis” checkbox. This will add a second y-axis to the chart. You can then format the second y-axis as needed.
