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Emilio owns a bakery. The number of boxes of cookies he has left on a Monday is represented by the function x + y = 42, where y is the number of boxes of cookies remaining in the bakery and x is the number of hours since he opened the bakery. How many boxes did he have at the start of business on Monday? (Note: x ≥ 0, y ≥ 0, and y takes only integer values.)

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frika
When Emilio started his business on Monday, he had spent x=0 hours. Since x+y=42, then y+0=42 and y=42 - the amount of boxes Emilio had at the start of his business

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