Higher November 2020 Paper 4 Q16
16 \(y\) is inversely proportional to the square of \(x\).
\(y = 2\) when \(x = 5\).
Find a formula linking \(x\) and \(y\). [3]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| \(y = \frac{50}{x^2}\) final answer | 3 | M2 for \(2 = \frac{k}{5^2}\) or better OR M1 for \(y = \frac{k}{x^2}\) oe or B1 for [\(k\) =] 50 | Condone proportionality symbol for equals in M1 |