Solve the system by substitution: 3x + 4y = 18 and y = 2x - 3. Provide exact values.

• A. x = 60/11, y = 117/11
• B. x = 30/11, y = 27/11
• C. x = 10/11, y = -1/11
• D. x = 3, y = 3

Answer: (B)