What Are Equations?PrerequisitesElementary AlgebraLinear EquationsPrerequisitesThe Times TableFractionsWhat Are Equations?Elementary AlgebraParenthesesQuadratic EquationsPrerequisitesFractionsWhat Are Equations?Elementary AlgebraLinear EquationsSystems of EquationsPrerequisitesThe Times TablesDivisionFractionsWhat Are Equations?Linear EquationsLinear FunctionsElementary AlgebraParentheses