Algebra Calculators

Calculate equation solver, linear equation and polynomial and other algebra calculations.

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All Algebra Calculators

Equation SolverSolve a linear or quadratic equation from its coefficients.Linear Equation CalculatorSolve a linear equation ax + b = 0 for x.Polynomial CalculatorEvaluate a polynomial at a specific value of x, for any degree.Quadratic Formula CalculatorSolve ax² + bx + c = 0 for x using the quadratic formula, including complex roots.System of Equations CalculatorSolve a system of two linear equations with two unknowns (x and y) using Cramer's rule.

Algebra Guides

Mathematics1 min read

How a Linear Equation ax + b = 0 Is Solved

Any linear equation in one variable reduces to the same two-step move — subtract the constant, divide by the coefficient — once it's rearranged into the standard ax + b = 0 form.

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Mathematics1 min read

How a System of Two Linear Equations Is Solved With Cramer's Rule

Cramer's rule solves for x and y as ratios of determinants built from the system's coefficients — a formula-driven alternative to substitution or elimination that scales cleanly to exactly two equations and two unknowns.

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Mathematics1 min read

Why Substitution and Cramer's Rule Agree on the Same System of Equations

Solving one equation from a system for a single variable, then running that reduced equation through the linear equation calculator, produces the exact same x and y values as the system calculator's Cramer's-rule answer.

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Other Mathematics Subcategories

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