Question

Which of the following tables represents a function??

Answer 1

Answer:

the correct answer is D

Answer 2

Answer:

The last table is the one that represents a function

Step-by-step 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)