Help, I really dont understand how to solve this

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?

Twelve less than a number is at most 20