The equation that shows how the total number of cups of ice used, y, depends on the number of glasses filled, x, is 
<h3>
Linear function</h3>
Filling the cooler is an illustration of a linear function
A linear function is represented as: 
Where
- m represents the slope/rate
- b represents the y-intercept/the initial value
- x and y are the variables
<h3>The equations</h3>
By comparison, we have the following parameters
--- the amount of cups per ice
---- the initial amount of cup
So, the equation that represents this scenario is

Read more about linear functions at:
brainly.com/question/14323743