Solve each system analytically. If the equations are dependent, write the solutions set in terms of the variable z. 3x+6y-z = 6 2x-3y+5z= -10 8x+9y-2z 12 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. There is one solution. The solution set is (Type an integer or a simplified fraction.) OB. There are infinitely many solutions. The solution set is {(z)}, where z is any real number. (Simplify your answer.) OC. The solution set is 0.