4400 Higher November 2009 Paper 3 Q14
14 Solve the simultaneous equations
\[\begin{aligned} 2x - 3y &= 3 \\ 3x + 6y &= 1 \end{aligned}\](3)
| Scheme | Marks |
|---|---|
| 2 lines where coeff of \(x\) or \(y\) are “equal” | M1 |
| \(x = 1\), \(y = -1/3\) | A1 A1 |
| (3) | |
| (3 marks) |
Notes
M1: eg \(4x - 6y = 6\) and \(3x + 6y = 1\) or \(6x - 9y = 9\) and \(6x + 12y = 2\)
and then add/subtract (condone 1 num. error) or make \(x\) or \(y\) the subject in either equation & subst.
A1 A1: Answers alone = M0A0