solving systems in Standard form, Algebra

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I need help with this question from my homework, the wiz tickets are selling fast! Adult tickets are $15 and student tickets are $10. a total of 285 tickets already sold for #3770. How many of each type of tickets already sold?
I have to define the variables x and y and write two equations.

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Set, {a|a=9 ,a=N,a

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