SOLUTION: tickets sold for 3.50 and students sold for 2.50 321 tickets where sold altogether for the musical at total of 937.50. how many adult tickets where sold

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Let = number of adult tickets sold
Let = number of student tickets sold
given:
(1)
(2)
-----------------------------
Multiply both sides of (1) by and
subtract (1) from (2)
(2)
(1)
(3)
135 adult tickets were sold
check answer:
(1)
(1)
(1)
and
(2)
(2)
(2)
(2)
OK