How Excel Charts Work A chart has an x-axis range and a y-axis range to show the correlation between two different data sets. The x-axis is the horizontal category line.

Graphs in Microsoft Excel typically chart time on the horizontal axis. Time is the independent variable in most relationships and dependent variables appear on the vertical axis.

Learn how to create a Combination Chart in Microsoft Excel. We also show you how to to combine bar and line graph & create Custom Combo Chart.