the equation y = 0.002x - 0.30 can be used to determine the approximate cost, y in dollars, of producing x items. how many items must be produced so the cost will be no more than $387?

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.