algebra
posted by natalie .
There were a total of 2000 tickets sold at a recent sporting event on Saturday. The cost of an adult ticket was $4.00 and a child's ticket was $2.00. The total amount of money collected was $6400.00. How many adult and child tickets were sold at the game?

A = # adult tickets
C = # child tickets

A+C = 2000
4A + 2C = 6400
Solve the two equations simultaneously for A and C.
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