4MA0 Foundation June 2014 Paper 2 Q8
8 \(w = 2a + b\)
(a) Work out the value of \(w\) when \(a = 5\) and \(b = 4\) (2)
(b) Work out the value of \(a\) when \(w = 28\) and \(b = 3\) (3)
| Scheme | Marks |
|---|---|
| 2×5 + 4 | M1 |
| 14 | A1 |
| (2) |
Notes
M1: for substitution
| Scheme | Marks |
|---|---|
| \(28 = 2a + 3\) | M1 |
| \(a = \dfrac{28 - 3}{2}\) | M1 |
| 12.5 | A1 |
| (3) | |
| (5 marks) |
Notes
M1: for correct substitution or rearrangement
M1: for correct rearrangement of correct substitution
A1: for 12.5 oe