Say your data set is in Columns A and B of the first sheet.
- On Insert ribbon, pick chart type as "Line with Markers"
- Right-click on chart, "Select Data...". Select your data in columns without column labels, so your data range would be something like
=Sheet1!$A$2:$B$5
.
- Profit! I mean you're done :-) You might want to change 'Series1' label Excel generates with an actual book name, you can do so in the above "Select Data" dialog.
You can do this with multiple books too - as long as their "pages remaining" data points are tracked on the same dates (e.g. Book2 data would be in Column C, etc...) Books will be represented by additional series.