Question 831673
A concert was attended by 449 people and total sales were $4748. Adult tickets $12 and Children tickets $7. How many of each ticket bought?
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Quantity: a + c = 449
Value:  12a +7c = 4748
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Modify for elimination:
12a + 12c = 12*449
12a + 7c  = 4748
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Subtract and solve for "c":
5c = 640
c = 128 (# of children's tickets sold)
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a + c = 449
a + 128 = 449
a = 321 (# of adult tickets sold)
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Cheers,
Stan H.
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