Algebra
posted by EddieG on .
A music concert was attended by 450 people. Adult tickets sold for $70 and childrenâ€™s tickets for $40. If total sales were $27,750, how much of each ticket was sold?

Set up two equations
a = adults
c = children
70a + 40c = 27750
a + c = 450
Solve by substitution or elimination
Substitution:
70a + 40c = 27750
a = 450  c
Elimination:
70a + 40c = 27750
70(a + c) = 70(450)