Relation 2
\begin{tabular}{|c|c|}
\hline Domain & Range \\
\hline 8 & pen \\
\hline 8 & star \\
\hline 8 & pencil \\
\hline 8 & sky \\
\hline 8 & rock \\
\hline
\end{tabular}

Function
Not a function

Answer

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Answer

Final Answer: The given relation is \( \boxed{\text{not a function}} \).

Steps

Step 1 ：Given the relation 2 with the following pairs: (8, pen), (8, star), (8, pencil), (8, sky), (8, rock).

Step 2 ：In a function, each element in the domain must map to exactly one element in the range.

Step 3 ：Here, the element '8' in the domain is mapping to multiple elements in the range: 'pen', 'star', 'pencil', 'sky', 'rock'.

Step 4 ：Therefore, the given relation is not a function.

Step 5 ：Final Answer: The given relation is \( \boxed{\text{not a function}} \).