Jaden's new puppy weighed 11 1/4 pound at 4 weeks old at 16 weeks old the puppy weighed 1 2/3 times more how much did Jaden pupp
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As the mapping suggests, the first (x) coordinate is decreased by 3, and the second (y) coordinate is increased by 2. So, given the inputs, you have
And yes, this rule is a function: it has a starting set (the domain), which is all possible couples , and a landing set (the codomain), which is again composed by the couples
. Since for every point in the domain you have one and only one output, this rule is a function.