Higher June 2018 Paper 4 Q11
11 \(y\) is directly proportional to the square of \(x\).
Find the percentage increase in \(y\) when \(x\) is increased by 15%. [4]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 32.25 | 4 | accept any correct method e.g. B1 for 1.15 M1 for \(y = k(1.15 \times x)^2\) M1 for \((1.15^2 - 1)\) [× 100] or [0].3225 OR B2 for \(1.15^2\) or 1.3225 or B1 for 1.15 M1 for \((1.15^2 - 1)\) [× 100] or [0].3225 If 0 scored award B1 for \(y = kx^2\) | accept if \(k\) replace by a numerical value |