GCSE R10 (Direct & indirect proportion)
Solve problems involving direct and inverse proportion, including graphical and algebraic representations
Source:GCSE Subject Level Conditions and Requirements for Mathematics. Ofqual, February 2017.
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/592159/GCSE_Subject_Level_Conditions_for_Mathematics_Feb_17.pdf