Solve the system by the substitution method.

25

X

+2y=

2x y

3 2

+==

56

Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

O A. The solution set of the system is.

(Simplify your answer. Type an ordered pair.)

B. There are infinitely many solutions.

OC. The solution set is the empty set.