6.2.35 solve using matrices. 5x-y-6z 2 9x+y- z=5 9x + y-5z = 7 select the correct choice below and, if necessary, fill in the answer boxes to complete your choice a. this system has exactly one solution. the solution is (type an exact answer in simplified form.) b. this system has infinitely many solutions of the form (type expressions using z as the variable ) where z is any real numbe o c. this system has no solution.