Higher November 2022 Paper 4 Q13
13 \(y\) is directly proportional to \(\sqrt{x}\).
\(y = 1\) when \(x = 16\).
Find a formula for \(y\) in terms of \(x\). [3]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| \(y = 0.25\sqrt{x}\) oe | 3 | M1 for \(y = k\sqrt{x}\) oe B1 for \(k\) = 0.25 or \(\frac{1}{4}\) oe | M1 includes e.g. \(y = k\sqrt{16}\) and \(1 = k\sqrt{16}\) |