The system of equations are  

Write the equations into matrix form , where is coefficient matrix, is variable matrix and is constant matrix.

Definition of inverse matrix :

If is an then , where .

Let , then .

, then has an inverse.

Cofactor of  is

Cofactor of

.

.

Find .

.

The inverse of the is .

.

Rewrite the equation.

Find .

.

, and .