This tool solves three types of equation. Linear finds the single value of x in ax + b = c. Quadratic finds the roots of ax² + bx + c = d — rearranging to standard form and applying the quadratic formula, giving two real roots, one repeated root, or no real solution depending on the discriminant. Simultaneous solves two equations with two unknowns using Cramer's Rule, finding x and y where both are satisfied at once.