Example 3

Fred and John are brothers. John, who is the older of the two and was largely deprived of attention as a young boy, is constantly trying to one - up Fred. Both brothers enjoy clothes shopping. However, because of John's competitiveness, every time Fred buys a new pair of jeans, John will go out and buy a pair that is $10 more expensive. Both pairs still look exactly the same, and all John is actually doing is demonstrating a lack of fiscal responsibility. Express in symbols the relationship between the amount of money Fred spends on a pair of jeans and the amount of money John spends on a pair of jeans. Let |

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