This question may be incomplete, so i will answer this in a really general way.
We have the equation:
17*y = 24*x - 582
Where this represents the amount of money made from the main floor and balcony tickets, where i suppose that 17*y represents the money and x is the number of tickets sold.
We are subtracting 582 from the right side, this may be related to the cost of the tickets.
Hope everything is clear.