The matrix  equation form is .

When, .

Therefore solution matrix is .

First find the determinant of  A = ad bc.

Product of two same sings is positive.

.

Therefore A^-1 exists.

The inverse of A is .

Substitute a = 5, b = , c = , d = 4 and ad bc = .

.

Substitute the values of in the solution matrix Multiply each side by .

The solution is .