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a bag contains only nickels and dimes. there are exactly 18 coins in the bag. the amount of money in the bag is $1.25.
let x represent the number of nickels in the bag. let y represent the number of dimes in the bag.
1. write a system of equations that correctly models this situation
2. does your answer represent integer values for the nickels and dimes? why must this be the case (or why does it not matter) ?

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