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There are several information's already given in the question. Based on those information's the answer can be easily arrived at. Let us first write down the details given.

Cost of a box of 10 wings = $7.00
Cost of a tray of nachos = $4.00
Amount that Freddy can spend is less that $40.
Then the equation will be

7x + 4y < 40

I hope the procedure is clear enough for you to understand.