Equations and identities An equation is a statement with an equals sign, stating that two expressions are equal in value, for example 3 x + 5 = 11 ...

When solving simultaneous equations with a linear and quadratic equation, there will usually be two pairs of answers.

George Mackiw, The Linear Group SL (2, 3) as a Source of Examples, The Mathematical Gazette, Vol. 81, No. 490 (Mar., 1997), pp. 64-67 ...