Solve the simultaneous equations
2b+20=7a5a+3b−1=0 \begin{aligned} 2b + 20 &= 7a \\ 5a + 3b - 1 &= 0 \end{aligned} 2b+205a+3b−1=7a=0217 exam-style questions on AQA GCSE Maths Simultaneous Equations. Each one has a worked solution and a mark scheme showing where the marks go.