Verified Answer :

altavistard

First of all:  Note that this is a linear relationship.  If you start at any x and increase x by 2, by how much does y decrease?  Verify that this decrease is the same for any two adjacent x-values.  Can you figure out the slope of this straight line by doing that?  Now think about the y-value you'd get if you were to decrease x not by 2, but by 1.

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