Which sentence represents a relationship between the number of bags of pretzels

Question

Which sentence represents a relationship between the number of bags of pretzels that Denise buys and her total grocery bill that results in a line with zero slope?

Denise buys the same number of bags of pretzels during every trip, but the other products that she buys change each time.

Denise only buys pretzels at the grocery store.

Denise uses coupons to buy one bag of pretzels, then can get up to 5 free.

Denise buys only things at the store that are the same price as the pretzels.

*explain ur answer:)

Explanation / Answer

Denise uses coupons to buy one bag of pretzels, then can get up to 5 free. For the slope to be 0, the total grocery bill must be the same no matter how many bags. For 1 to 6 bags, the total bill is the same, so the slope is 0. I don't see this happening in any other choice; in the other choices, there could be diffent total grocery amounts.

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