To determine how much money will be made by selling nine tickets, we would need a clear idea of the selling price per ticket and any other relevant information (like potential group discounts, etc.). Since you mentioned a graph showing the money made by selling up to 18 tickets, the money for selling each ticket would typically increase linearly in this case.
If you can describe the graph or provide the price per ticket, we can calculate the total earnings from selling nine tickets. For example, if tickets are sold at $10 each, selling nine tickets would yield:
\[ 9 \text{ tickets} \times 10 \text{ dollars/ticket} = 90 \text{ dollars} \]
Please provide additional details or clarify any specifics so I can help you accurately.