Solve the following system of equations using the Gauss Jordan method 15x 15y z 13 9x 25y 2z 69 12x 15y z 22 Select the correct choice below and if necessary fill in the answer boxes to complete your choice O A This system has exactly one solution The solution is Type an exact answer in simplified form OB This system has infinitely many solutions of the form z where z is any real number Type expressions using z as the variable