4400 Higher November 2007 Paper 3 Q11
11 Make \(x\) the subject of \(3x - y = x + 7\)
(3)
| Scheme | Marks |
|---|---|
| \(2x - y = 7\) or \(3x = x + y + 7\) | M1 |
| \(2x = y + 7\) | M1 |
| \((y + 7)/2\) | A1 |
| (3) | |
| (3 marks) |
Notes
M1: correctly collect \(x\) terms
M1: correctly add \(y\) to bs
A1: or \(\frac{1}{2}(y + 7)\) or \(y/2 + 3.5\) etc