Bobby Y. answered 01/26/16
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5
(3)
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If x= # of adult tickets and y= # of student tickets
5x + 1y = 2874
x + y = 1246
x=1246-y
5(1246-y) + 1y = 2874
6230-5y+1y = 2874
-4y = 2874-6230
-4y = -3356
y = 839
x + 839 = 1246
x = 1246 - 839
x = 407
407 Adult tickets and 839 Student tickets sold