Determine the approximate value of side a.

Acarnival sold tickets for $1.50 for adults and $1.00 for students. there were 54 tickets sold for a total of $70.50. write a system of equations to represent the number of adult tickets,x, and the number of student tickets,y. find the solution and explain what it means. i'll you if you me

Nine more than four times a number is the same as one less than twice the number. find the number?

How do you solve a question like this?