Show that (2,−4)(2,-4)(2,−4) and (−0.8,4.4)(-0.8,4.4)(−0.8,4.4) are solutions of the simultaneous equations
x2+y2=20 x^2 + y^2 = 20 x2+y2=20 3x=2−y 3x = 2 - y 3x=2−y223 exam-style questions on Edexcel GCSE Maths Quadratic Simultaneous Equations. Each one has a worked solution and a mark scheme showing where the marks go.