Math Equation |Types of Equations with Solution - BYJUS WebLinear equations with two variables : 9x + 6y – 82 =0. Quadratic Equations. The quadratic equation is a second-order equation in which any one of the variable contains an exponent of 2. The general form of the quadratic equation is. ax 2 +bx+c = 0, a ≠ 0. Example : 5x 2 – 5y -35=0. Here a = 5, b=-5 and c=-35. Radical Equations