The part of the expression that represents the percent that Skylar will pay for the dress pants is:

40(1−y)

This expression shows that Skylar will pay $1-y$ (the percentage he has to pay after the discount) multiplied by the original price of the dress pants, which is $40.

If you have any more questions or need further explanation, feel free to ask!

Here are five related questions:

1. What does the expression $(1−x)30$ represent in the context of this problem?
2. If Skylar has a 25% discount on the dress pants, what is the new cost of the pants?
3. How would the expression change if Skylar used the total purchase coupon instead?
4. What does the term $20$ represent in the first expression?
5. How would you calculate the total cost if Skylar used both the dress pants and the shirt coupons?

Tip: When working with percentages in expressions, remember that a percentage off is represented by $(1 - \text{percentage as a decimal})$.