The average salary (in thousands of dollars ) of a major league baseball player from 1985 to 2001 can be modeled by the function f(x)=106x+ 185, where x is the number of years since 1985. How much did the average salary increase between 1987 and 2000?

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.

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