The equations are

                                        Equation (1)

                                    Equation (2)

                                 Equation (3)

Apply CRAMER RULE.

Evaluate each determinant.

product of two same sings is positive.

product of two different sings is negative.

Apply CRAMER RULE.

Evaluate each determinant.

product of two same sings is positive.

product of two different sings is negative.

Apply CRAMER RULE.

Evaluate each determinant.

product of two same sings is positive.

product of two different sings is negative.

The solution is .