To model the situation, we need to create two equations that represent the total number of items and the total cost.
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For the total number of items given away (bags and caps), the equation is: \[ b + c = 2000 \]
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For the total cost, since bags cost $10 each and caps cost $5 each, the equation is: \[ 10b + 5c = 12500 \]
Thus, the correct pair of linear equations is: \[ b + c = 2000 \] \[ 10b + 5c = 12500 \]
So the response would be: "b + c = 2000; 10b + 5c = 12,500".