Method of Determinants is considered as an easier solution when you have more than two equations to solve:

Let’s consider mentioned three equations:

Where I_{1}, I_{2} and I_{3} are the unknown, we need to solve the equation for.

Let’s write the same in the matrix form:

We can calculate the value of the unknowns, I_{1}, I_{2} and I_{3} by the following matrix calculation:

Considering the value of △ as a non-zero figure, this rule can be applied to any system that has n number of linear equations. This rule is known as Cramer’s Rule.