solving a value mixture problem using a linear equation

Question

At the movie theatre, child admission is $6.00 and adult admission is $9.10. On Friday, 161 tickets were sold for a total sales of $1232.60. How many child tickets were sold that day?

Answer 1

C + A = 161

6C + 9.1A = 1232.60

2 equations, 2 Unknowns. Solve with substitution or elimination!