The correct response is: Barbara’s equation did not consider the number of bottles of water.
The equation she wrote, \(1.25 + 1.49y = 100\), does not appropriately represent both the sales from iced tea (y, priced at $1.49) and water (x, priced at $1.25). To find the total sales, she should have included both variables, typically in the form \(1.25x + 1.49y = 100\), where x is the number of bottles of water sold and y is the number of bottles of iced tea sold.