Question

Which set of ordered pairs represents a function?

Answer 1

The correct is:

$[(-9,3),\:(-5,1),\:(7,-5),\:(4,3)]$

The definition of a function is that for every value of $x$ we get one from $y$.

In the first appears $(-6,1)$ y $(-6,-7)$, it is not a function, since it does not meet the definition given above, there can only be one value for x, if there are $2$ or more, called relation.

In 2 repeat: $(7,-6)$ and $(7,0)$

In 3 repeat: $(1,-3)$ and $(1,0)$