Direct proportion
| Paper | Question Topic | Written Solution | Video Solution |
|---|---|---|---|
| 2008-11-12 EdExcel 5540H-4H | Q22 Direct proportion | Yes | No |
| 2009-11-10 EdExcel 1380-4H | Q25 Direct proportion | Yes | No |
| 2013-11-06 EdExcel 1MA0-1H | Q21 Direct proportion | No | Yes |
| 2008-05-19 EdExcel 5540H-1F | Q05 Direct proportion | No | No |