Author note — to cover (Higher)

Higher only, from R13's braced 'construct and'. Cover forming y = kx from a proportionality statement plus one value pair, finding k, interpreting it in context, and evaluating either variable. Include statements from words. Foundation meets interpretation on ratios-and-linear-functions and the graph pages; powers and roots follow on proportion-to-powers. (R13, R10)

• Fluency — direct questions on constructing y = kx, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).