Marcos purchases a top-up card for his pre-paid cell phone. His remaining balance, , can be modeled by the equation B = 35 - 0.35n , where is the number of minutes he's talked since purchasing the card.

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.