What is the domain?

The function y = 45x + 6 can be used to determine the cost for a person to purchase x tickets to a concert. A person can purchase up to 8 tickets. What is an appropriate domain for the function?

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The domain is the set of inputs or x-values.  In this case, the domain would be the possible number of tickets that could be bought.  The range or y-values would be the possible total costs.

If a person can purchase up to 8 tickets,
then the domain would be {0,1,2,3,4,5,6,7,8}

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