Solve the following system by the method of reduction.
2x - 6z = 24
x - 3y - 3z = 30
x + y -3z = 6
3x + y + z = 0
Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice.
A. x = ___, y = ___, z = ___
(Type integers or fractions.)
B. x=r, y= ___, z= ___
(Type integers or fractions.)
C. There is no solution.