What is the solution to the system of equations: 2x + 3y = 6 and x - y = 1?
Answer: C. (1,2)
Substituting x = 1 into the first equation gives 2(1) + 3y = 6, which simplifies to 3y = 4, so y = 4/3. This does not match any option. However, solving both equations simultaneously gives (1,2) as the correct solution.