00:01
So this question is asking if something is a function or not.
00:04
So which of the following graphs is not a function? so there are two ways that i tend to explain to focus on when you're trying to figure out if something is a function or not.
00:13
If you have a table of values or coordinate points or something like that, you look for the x values and they should not repeat.
00:22
Basically the rule of a function is that each x value is paired with, or is matched up to or produces only one y value.
00:42
Okay, so for every x, there's only one y.
00:45
So if you see x values repeating itself, repeating themselves on a table, like you have two comma three and two comma five, that's not a function because two is has two different outputs as three and five that i could run into.
00:59
That's not a function.
01:00
So one of the translations of that or one of the ways to look at that is the vertical line test...