Question

Which set of ordered pairs represents a function?

{(7,-2),(-8, -1),(-6,1), (-6, – 7)}
{(-4,1), (6,1),(7,-6), (7,0)}
{(2,-6), (1, -3), (-5,7),(1,0)}
{(-9,3), (-5,1), (7,-5), (4,3)}​

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)`