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You and your friend are selling tickets to a charity event. You sell 4 adult tickets and 11 student tickets for $148. Your friend sells 7 adult tickets and 5 student tickets for $145. What is the cost of a student ticket?

Respuesta :

4x + 11y = 148
7x +  5y = 145

multiply first equation by 7 and second by -4:-

28x + 77y = 1036
-28x - 20y = -580      Adding:-

0 + 57y = 456

y = 456 / 57 =  8

Cost of a student ticket = $8  Answer

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