Select the set of equations that represents the following situation: The sum of two numbers is 77, and their difference is nineteen less than the smaller number. What are the two numbers?

(Points : 3)

2y = 77; 77 = x – 19

2x = 77; 77 = x + 19

x + y = 77; x – y = 19 – x

x + y = 77; y – x = x – 19