4MA0 Foundation June 2012 Paper 1 Q12
12
(a) Solve \(2x + 9 = 1\) (2)
(b) Solve \(3(2y - 1) = 6\)
Show clear algebraic working. (3)
Show clear algebraic working. (3)
| Scheme | Marks |
|---|---|
| \(2x = 1 - 9\) or \(2x = -8\) or \(2x + 8 = 0\) | M1 |
| −4 | A1 |
| (2) |
Notes
A1: Award 2 marks for a correct answer, unless clearly obtained by an incorrect method
| Scheme | Marks |
|---|---|
| \(6y - 3 = 6\) or \(2y - 1 = 2\) | M1 |
| \(6y = 6 + 3\) or \(6y = 9\) or \(6y - 9 = 0\) or \(2y = 2 + 1\) or \(2y = 3\) or \(2y - 3 = 0\) | M1 |
| \(1\dfrac{1}{2}\) oe | A1 |
| (3) | |
| (Total 5 marks) |
Notes
M1: for correct expansion (\(6y - 3\) seen) or correct division of both sides by 3 (\(2y - 1 = 2\))
May be implied by second M1
M1: for correct rearrangement
Also award for \(6y = 6 + 1\) or \(6y = 7\) or \(6y - 7 = 0\) if preceded by \(6y - 1 = 6\)
A1: Award 3 marks if answer is correct and at least one method mark scored