Higher November 2019 Paper 5 Q14
14 \(y\) is inversely proportional to the square root of \(x\).
\(y = 7\) when \(x = 25\).
Find the value of \(y\) when \(x = 100\). [3]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 3.5 | 3 | M2 for \(\frac{7 \times \sqrt{25}}{\sqrt{100}}\) oe Or M1 for \(\frac{y}{7} = \frac{\sqrt{25}}{\sqrt{100}}\) oe OR M1 for \(y = \frac{k}{\sqrt{x}}\) oe B1 for \(k = 35\) | Accept \(ky = \sqrt{x}\) Accept \(k = \frac{5}{7}\) |