4MA0 Foundation January 2015 Paper 1R Q13
13 \(M = 4g - 3h\)
(a) Work out the value of \(M\) when \(g = -5\) and \(h = 8\) (2)
(b) Work out the value of \(g\) when \(M = 30\) and \(h = 6\) (3)
| Scheme | Marks |
|---|---|
| 4×−5 − 24 or −20 − 3×8 or −20 − 24 | M1 |
| −44 | A1 |
| (2) |
Notes
M1: for correct evaluation of one term ie. −20 or 24 or
| Scheme | Marks |
|---|---|
| \(30 = 4g - 3\times6\) or \(M + 3h = 4g\) or \((30 + 3\times6)\div4\) | M1 |
| \(30 + \text{"18"} = 4g\) or \(48 = 4g\) or \(30 + 3\times6 = 4g\) | M1 |
| 12 | A1 |
| (3) | |
| (5 marks) |
Notes
M1: for correct substitution or correct rearrangement
M1: for correct substitution and correct rearrangement