Final answer:
The cost of each ticket cannot be determined with the given information.
Step-by-step explanation:
To find the cost of each ticket, we can set up an equation using the given information:
Revenue = 10x + 8y
Since the revenue on opening night was $13,900, we can substitute this value into the equation:
13,900 = 10x + 8y
To solve for x and y, we need another equation. However, without any additional information, we cannot determine the exact cost of each ticket. So, the answer cannot be determined with the given information.