Foundation June 2018 Paper 1R Q25
25 Solve
\[\begin{aligned} 3x + 2y &= 15 \\ 10x - 4y &= 2 \end{aligned}\]Show clear algebraic working.
(3)
| Scheme | Marks |
|---|---|
| \(16x = 32\) or \(32y = 144\) | M1 |
| \(3 \times \text{'}2\text{'} + 2y = 15\) or \(3x + 2 \times \text{'}4.5\text{'} = 15\) | M1 |
| \(x = 2\), \(y = 4.5\) | A1 |
| (3) | |
| (3 marks) |
Notes
M1: for a correct sequence of operations which leads to 1 equation in one unknown, allowing one arithmetical error
M1: (dep) substitute found value of one variable in one equation