4MA0 Higher January 2015 Paper 3 Q12
12 Solve the simultaneous equations
\[\begin{aligned} 5y - 4x &= 8 \\ y + x &= 7 \end{aligned}\]Show clear algebraic working.
(3)
| Scheme | Marks |
|---|---|
| Eg \(9y = 36\) or \(9x = 27\) or \(5(7 - x) - 4x = 8\) or \(5y - 4(7 - y) = 8\) | M1 |
| \(x = 3\), \(y = 4\) | A2 |
| (3 marks) |
Notes
M1: For a correct method to find an equation in \(x\) or \(y\).
Condone 1 arithmetic error.
A2: Dep on M1
A1 for each value