Write and solve system of equations that can be used to solve the following problem. each child ticket for a ride costs $3, while each adult ticket costs $5. if the ride collected a total of $150, and 40 tickets were sold, how many of each type of ticket were sold? where c is the number of child tickets and a is the number of adult tickets.

! i'm thinking it's 3c+5a=$150 but now i'm not so sure, it seems wrong. asap