Solve algebraically the simultaneous equations
x2+3y2=21 x^2 + 3y^2 = 21 x2+3y2=21 y−x=1 y - x = 1 y−x=1117 exam-style questions on AQA GCSE Maths Quadratic Simultaneous Equations. Each one has a worked solution and a mark scheme showing where the marks go.