Direct and inverse proportion
Solve proportion problems with the unitary method and with formulae y = kx and y = k/x, recognise proportion in tables and graphs, and (Higher) work with y ∝ x², y ∝ 1/x² and y ∝ √x.
You will be able to
- Use the unitary method for direct proportion
- Find and use y = kx and y = k/x
- Solve workers-and-time problems with inverse proportion
- Recognise proportion from a table or a graph
- Use y ∝ x², y ∝ 1/x² and y ∝ √x (Higher)
25 minutes, 7 exam-style questions, with the Graphing Calculator.