Elizabeth joins a CD buyer's club. She receives 10 free CDs when she joins this club. She must buy 3 CDs each month.

Complete the following in the Answer Book:

• Write an equation that represents the number of CDs (y) Elizabeth will receive from the CD buyer's club after x months.
   
• What is the y-intercept of your equation? What does the y-intercept mean in the context of this problem?
   
• Elizabeth wants to receive no more than 55 CDs from this club. What is the maximum number of months Elizabeth will remain in the CD buyer's club? Use mathematics to explain how you determined your answer. Use words, symbols, or both in your explanation.