A company plans to sell bicycle helmets for $26 each. The company's business manager estimates that the cost, y, of making x helmets is a quadratic function with a y-intercept of 8,400 and a vertex of (500, 15,900). x = number of helmets

y = amount in dollars

Which system models this situation?

y = 26x and y = 8,400(x-500)2+15,900

y = 26x and y = -0.030(x-500)2+15,900

y = x/26 and y = -0.030(x-500)2+15,900

y = x/26 and y =8,400(x-500)2+15,900