Yummy's Catering Service is organizing a formal dinner party. They are expecting at most 280 guests. The hall has two kinds of tables, one that seats 4 people and one that seats 10 people. The hall can have up to a total of 52 tables. Let x represent the number of 4-seat tables and y the number of 10-seat tables. Which inequalities can be used to determine the possible combinations of tables that can be used for the event so there are enough seats for all the people?