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.

Question

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.

anonymous · Answer

20 and 17

mertsj · Answer

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