Question

look at this table:

x	y
7	11
-1	6
12	12

is this relation a function?
yes no
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work it out
not feeling ready yet? these can help:
input/output tables: find the rule (83)
lesson: relations and functions

Explanation:

Step1: Recall function definition

A relation is a function if every input $x$ has exactly one output $y$.

Step2: Check $x$-values in the table

Look at the $x$-value 12: it maps to $y=4$ and $y=12$.

Answer:

no