Answer:
(D) X represents the number of level 1 tickets.
D. represents the number of level 1 tickets; represents the number of level 2 tickets
The costs of the tickets are represented as constants ( and ), and so they are not variables.
We know is level 1 tickets and is level 2 tickets because the price of a level 1 ticket is $50 and the second equation contains . Similarly, the cost of a level 2 ticket is $150 and the equation contains .
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