help with number 16 please ???
So a is the number of adult tickets and s is the number of student ticketsa+s=180$4a + $2.5s = $645a+s=180a=180-s4a+2.5s=6454(180-s)+2.5s=645720-4s+2.5s=645720-1.5s=64575-1.5s=01.5s=75s=50a+s=180a+50=180a=130
