briweaver8977 briweaver8977

20-06-2017
Mathematics

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You and your friend are selling tickets to a charity event. You sell 9 adult tickets and 13 student tickets for $212. Your friend sells 4 adult tickets and 15 student tickets for $168. What is the cost of a student ticket?

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derpy16000 derpy16000

21-06-2017

x=adult tickets
y=student tickets

(9x+13y=212)*4= 36x+52y=848
(4X+15y=168)*9= 36x+135y=1512

subtract both equations -83y=-664
divide by -83 y=8

student tickets cost $8

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