Suitable straight line

Key term for Edexcel GCSE Mathematics, used in Solving Equations and Inequalities.

Definition

An auxiliary line (either $y = k$ or $y = mx + c$ ) drawn on a grid to help solve a quadratic equation graphically.

Exam Context

Suitable straight line appears in Edexcel GCSE Mathematics revision content for Algebra, especially Solving Equations and Inequalities and Quadratic Equations.

Algebra Solving Equations and Inequalities Quadratic Equations

Found in Revision Notes

Algebra

Solving Quadratic Equations: Graphical Methods

Solving Equations and Inequalities • Quadratic Equations

Revise note

Related Key Terms

Approximate solution Intersection point Parabola Roots

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Table of values

Turning point (vertex)

x-intercept