Use a system of linear equations to solve the problem.Devon purchased tickets to an air show for 7 adults and 2 children. The total cost was 
. The cost of a child's ticket was 
less than the cost of an adult's ticket. Find the price of an adult's ticket and a child's ticket.
A. adult's ticket: $15; child's ticket: $12
B. adult's ticket: $14; child's ticket: $11
C. adult's ticket: $13; child's ticket: $10
D. adult's ticket: $12; child's ticket: $9
Answer: C
Mathematics
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.
?
A. 
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