Foundation November 2018 Paper 1 Q25
25 Solve the simultaneous equations
\[\begin{aligned} 5x + y &= 21 \\ x - 3y &= 9 \end{aligned}\](3)
| Answer | Mark | Mark scheme |
|---|---|---|
| \(x = 4.5\), \(y = -1.5\) | M1 | correct process to eliminate one variable (condone one arithmetic error) |
| M1 | (dep) for substituting found value in one of the equations OR correct process after starting again (condone one arithmetic error) | |
| A1 | for \(x = 4.5\), \(y = -1.5\) oe |
Additional guidance
Fractions do not need to be in simpleast form