4. The total number of tickets sold at the Friday night football game was 1,650. Each adult ticket cost $3.50 and each student ticket cost $2.00.
The total revenue for ticket sales was $4,650. Which system of
equations could not be used to determine the number of adult
tickets, a, and student tickets, s, sold at the game?
a + s = 1650
A) 3.5a + 2s
4650
1650 - Sa
B) 3.5a + 25
4650
a + s = 1650
C) 3.5a - 4650
2s
D) a+s=1650 2a+3.5s= 4650

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