Higher November 2017 Paper 4 Q11
11 \(y\) is inversely proportional to \(x^2\) and \(y = 5\) when \(x = 4\).
Find a formula linking \(x\) and \(y\). [3]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| \(y = \dfrac{80}{x^2}\) oe | 3 | M1 for \(y = \dfrac{k}{x^2}\) oe B1 for \(k = 80\) | implied by \(5 = \dfrac{k}{4^2}\) oe |