Question 8 of 20 Which of the following lists of ordered pairs is a function?
A. (0,4), (1, 2), (1, 0), (2,3)
B. (2,5), (3, 3), (4, 11),(4, 12)
C. (1,7), (2,5), (3, 6), (4,1)
O D. (3,-2), (2, -1), (3, 4), (4,7)

Acollege is selling tickets for a winter fund-raiser. one day, krissa sold 14 adult tickets and 8 student tickets for a total of $376. the next day, she sold 7 adult tickets and 11 student tickets for a total of $272. krissa wanted to find the price of one adult ticket, a, and the price of one student ticket, s. she wrote and solved the following system of equations.