Which relation is a function?
(PICTURE / QUESTION INCLUDED)
![Which relation is a function PICTURE QUESTION INCLUDED class=](https://us-static.z-dn.net/files/de2/de7e7ce2e25f2208a3ca3c8e32418e86.png)
A relation is a function if there is only 1 Y value for every X value.
If there are 2 or more dots on an X value, it cannot be a function.
The correct graph is the lower left one, because all the dots are separated.