Solve the following system analytically. If the equations are dependent, write the solutions set in terms of the variable z. x-y+z=-7 8x+y+z=8 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 {D} (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. Use integers or fractions for any numbers in the expressions.) OC. The solution set is.