Foundation November 2020 Paper 2 Q21
21 Solve the simultaneous equations.
\[\begin{aligned} 2x + 3y &= 10 \\ 3x + 5y &= 17 \end{aligned}\][4]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| \([x =]\ -1\) \([y =]\ 4\) | 4 | M1 for attempt to equate coefficients M1 for correct method to eliminate 1 variable A1 for 1 correct solution If A0, SC1 for a pair of values that satisfy one of the original equations | ISW correct answers seen in working then reversed Condone 1 arithmetic error – a sign error is not an arithmetic error Condone 1 further arithmetic error Alt method M1 for rearrangement of one equation to make either \(x\) or \(y\) the subject M1 for correct substitution of their rearrangement into the other equation |