4400 Higher November 2010 Paper 3 Q12
12 Solve the simultaneous equations
\[\begin{aligned} 2x - 5y &= 13 \\ 6x + 3y &= 3 \end{aligned}\](3)
| Scheme | Marks |
|---|---|
| 2 lines where coefficients of \(x\) or \(y\) are equal | M1 |
| \(x = 1.5\), \(y = -2\) | A1 A1 |
| (3) | |
| (3 marks) |
Notes
M1: e.g. \(6x - 15y = 39\), \(6x + 3y = 3\) or \(6x - 15y = 39\), \(30x + 15y = 15\)
and then add/subtract (condone 1 arithmetic error)
leads to \(18y = -36\) or \(36x = 54\)
or make \(x\) or \(y\) subject and substitute correctly