Question 481922
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Hi, misclick
Let x and y represent the cost of the adult and student tickets resepctively:
2x + 4y = 14   |Jack
2x + 6y = 23   |Bill 

-2x - 4y = -14   
 2x + 6y = 23
       2y = 9
        y = 4.50, cost of student ticket, as You said, does not make sense.
Check the money spent by each, possibly a typo there.
Sure sign of that would be the values given.