4MA0 Higher January 2015 Paper 4R Q4
4 Solve
\[\begin{aligned} x + 2y &= 3 \\ x - y &= 6 \end{aligned}\]Show clear algebraic working.
(3)
| Scheme | Marks |
|---|---|
| \(2y - -y = 3 - 6\) or \(x + 2x = 3 + 12\) | M1 |
| A1 | |
| \(x = 5\), \(y = -1\) | A1 |
| (3 marks) |
Notes
M1: for a complete method to eliminate one variable (condone one arithmetic error)
A1: \(x = 5\)
A1: \(y = -1\)
NB: Candidates showing no working score 0 marks