To model the situation, we can use the following two equations based on the information provided:
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The total number of items sold equation: \( p + s = 200 \)
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The total profit equation: \( 3p + 2s = 550 \)
So, the pair of linear equations that model the situation is:
- \( p + s = 200 \) (for the total number of items sold)
- \( 3p + 2s = 550 \) (for the total profit)