Question

Which of the following tables represents a function??

Answer 1

the correct answer is D

Answer 2

The last table is the one that represents a function

Explanation:

To be a function you can't have two different y values for the same x.

In option one, for
`x =2`, we have two values for
`y`:
`y = 2` and
`y = -2`. So this is not a function.

In option two something similar happens, for
`x = 5` we have two different
`y` values:
`y = 2` and
`y = 8`, this is also not a funcion.

In option three for
`x = 3` we also have two different values of
`y`:
`y = 4` and
`y = 5`, this is not a function.

The correct option is the fourth:

In option four, for every
`x` we have a different value of
`y` and we don't have two
`y`'s for the same
`x` (like in the other options)