Final answer:
John spends $12 per ticket on movie tickets as indicated by the ticket-related term 12x in the equation 12x+18=y.
Step-by-step explanation:
The question asks how much John spends per ticket if the total amount he spends (y) and the number of tickets he buys (x) are related by the equation 12x+18=y. To find out the cost per ticket, we need to identify the part of the equation that represents the ticket cost. We do this by isolating the ticket-related term. Since the only other term in the equation (18) doesn't have an x, it's likely to represent the snack cost, which means that the 12x part of the equation represents the total cost for the tickets. Thus, if y is the total cost and x is the number of tickets, dividing the total cost for tickets by the number of tickets (12x/x) will give us the cost per ticket, which is $12 per ticket.