Adult tickets for the school musical were sold for 3.50 and student tickets were sold for 2.50. 138 tickets were sold for 427 how many of each tickets were sold

Question

I really need help with coming up with the equations for this.

Answer 1

let A number of adults and S the number for students, then we will have

 

3.5A + 2.5S = 427    we will have also  A + S = 138

these are the two equations solving them we have ;  S=56  A=82