Type of equations, separated by degree:

**Equation of first degree, linear equation:**

kx + d = 0

**Equation of second degree, quadratic equation:**

ax^{2} + bx + c = 0

**Equation of 3rd degree, cubic equation:**

ax^{3} + bx^{2} + cx + d = 0

When applied it gives a scheme to correctly calculate a figure in a coordinate system.

As correctly pointed out by BrianShader, the list goes on forever. After the cubic equation there is the quartic equation, then there comes the quintic...