Equation Solver
Solve linear, quadratic and systems of equations step by step, free online.
Solution
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Results update as you type.
About this calculator
An equation solver finds the values that satisfy an equation. This tool solves linear equations, quadratic equations (via the quadratic formula, including complex roots) and systems of two linear equations. Choose the type, enter the coefficients, and get the solution with the key working shown.
Frequently asked questions
What types of equations can it solve?
Linear equations (ax + b = 0), quadratics (ax² + bx + c = 0, including complex roots), and 2×2 systems of linear equations.
Does it show complex roots?
Yes. When a quadratic has a negative discriminant, the solver reports the two complex conjugate roots rather than saying there is no solution.
Results are estimates for general guidance only, not financial, medical or tax advice.