The most useful selection is a bar chart, because it allows you to format the second series as a line. Superimposing two types of charts makes identifying the two data scales easier.

How to Style Line Graphs in Illustrator. Adobe Illustrator's Graph tool opens a miniature spreadsheet-like window into which you can enter rows and columns of data to produce column, bar, line ...

Learn about line graphs with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

Learn how to draw and understand information presented by a line graph with this interactive guide by BBC Bitesize for KS2 pupils.

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