Question 220864
An outdoor amphitheatre has 25,000 seats. Ticket prices are $15, $17, and $25. The number of tickets priced at $17 must equal two times the number priced at $25. How many tickets should be sold ( assuming all seats can be sold) to bring in $434,500? . Set up a system of equations an dsolve using th inverse matrix method. 
I was setting up like this: 
X+Y+Z = 25,000
15x + 17y + 25z = 43500 
The number of tickets priced at $17 must equal two times the number priced at $25.
y = 2z
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That's the 3rd equation.
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