Rearrange the equation
3x=2−y 3x = 2 - y 3x=2−yto make y y\,y the subject.
Hence solve the simultaneous equations
x2+y2=2 x^2 + y^2 = 2 x2+y2=2 3x=2−y 3x = 2 - y 3x=2−y223 exam-style questions on WJEC GCSE Maths Quadratic Simultaneous Equations. Each one has a worked solution and a mark scheme showing where the marks go.