Skyway Amphitheater sells pavilion tickets for $45 per ticket and lawn tickets for $15 per ticket. You and your group of friends bought tickets for a concert this Friday and the total bill was $315. This scenario can be modeled by the equation 45x + 15y = 315 where "x" represents the number of pavilion tickets and "y" represents the number of lawn tickets. Which of the following is not a possible combination of pavilion tickets and lawn tickets?
3 pavilion tickets and 10 lawn tickets
7 pavilion tickets and 0 lawn tickets
4 pavilion tickets and 9 lawn tickets
0 pavilion tickets and