The system of equations are 3x + 4y = 18 and 3x + 4y = 18.

Write the system of equations in matrix equation form, A . X = B, where A = coefficient matrix, X = variable matrix and B = constant matrix.

Find the inverse of the coefficient matrix.

First find the determinant of the coefficient matrix .

The determinant of the coefficient matrix is zero, so does not exist.

There is no unique solution of this system.