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Mathematics 9 Online
OpenStudy (anonymous):

Solve the problem. Devon purchased tickets to an air show for 7 adults and 2 children. The total cost was $174 . The cost of a child's ticket was $3 less than the cost of an adult's ticket. Find the price of an adult's ticket and a child's ticket.

OpenStudy (anonymous):

20 and 17

OpenStudy (mertsj):

7a+2c = 174 c=a-3 Those are your two equations. Use substitution and replace c in the first equation with a-3

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