Foundation June 2022 Paper 1 Q15
15. Rearrange this formula to make \(n\) the subject. [2]
\[t=5+3n\]| Scheme | Marks | Comments |
|---|---|---|
| \(t-5=3n\) oe, si or \(\dfrac{t}{3}=\dfrac{5}{3}+n\) | B1 | Isolates term in \(n\); allow e.g. \(-3n=5-t\) or correctly divides through by 3 |
| \(n=\dfrac{t-5}{3}\) or \(\dfrac{t}{3}-\dfrac{5}{3}=n\) oe | B1 | May be unsimplified; allow e.g. \(n=(t-5)\div 3\) or \(n=\dfrac{5-t}{-3}\) If no marks, award SC1 for \(n=\dfrac{t+5}{3}\) or \(\dfrac{t-5}{3}\) (subject omitted) |
| (2) |