a) Prom allows people to buy tickets for singles or couples. The
total number of people at the dance was 130. Single tickets cost
$40 and couples tickets cost $75 and there was a total of $4950
in ticket sales. How many singles and couples tickets were sold?
i)Define variables (what unknowns is being solved for)

ii)Write an equation based on each constraint/info.
total cost = cost of single tickets + cost of couple tickets
# of people = single people + couples people

iii)Solve the system above

iv) Write a sentence that answers the question.