Author note — to cover (Higher)

Higher only, from R13's braced 'construct and'. Cover forming y = k/x from an inverse statement and one value pair, using the equivalence with proportionality to 1/x, evaluating both ways, and contrasting with the direct case. Curve recognition stays on the both-tier graphs page; squared-denominator forms belong to proportion-to-powers. (R13, R10)

• Fluency — direct questions on constructing y = k/x, 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).