A function $$ f: \mathbb{Z} \rightarrow \mathbb{Z} $$ is defined by $$ f(x)=x+9 $$

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The function $$ f(x) = x + 9 $$ is a bijective (one-to-one and onto) function from the integers to the integers. It has an inverse function $$ f^{-1}(y) = y - 9 $$.

A function \( f: \mathbb{Z} \rightarrow \mathbb{Z} \) is defined by \( f(x)=x+9 \)

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A function \( f: \mathbb{Z} \rightarrow \mathbb{Z} \) is defined by \( f(x)=x+9 \)

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