Solve the simultaneous equations
5x=7+yx+4y=9 \begin{aligned} 5x &= 7 + y \\ x + 4y &= 9 \end{aligned} 5xx+4y=7+y=9217 exam-style questions on Eduqas GCSE Maths Simultaneous Equations. Each one has a worked solution and a mark scheme showing where the marks go.