Determine if each Relation is a Function - Example

In this video, we explain how to determine if a relation is a function. Remember for each x, there can be one and only one y. So if we lay out a relation in terms of ordered pairs, each first component can appear only once. Additionally, we need to remember that not all relations are functions, but all functions are relations.

[Greenemath]

@bestiies4liifex3

So your relation {(3, 4), (6, 7), (9, 4)} is a function. There are no duplicate x values. When you plug in a 3 you get a 4. When you plug in a 6 you get a 7. When you plug in a 9 you get a 4. It does not matter that there is a duplicate y value. The only thing that matters here is that you don't have a duplicate x. Remember, for each x you can have one and only one y value.

[brandyanderson]

Thank you SO much. This was short and to the point 🙏🏽

[Funkyjunkyjokermonki]

your videos are so helpful! my teacher explains this to me.... i watch your video on the same subject... I GET IT! haha :D Thanks so much!!! :D

[MegaBlizzard]

Thanks man u helped me and specifically on the question i needed thank you.

[VioletMystique]

Can I ask you to do a video on a lesson for Algebra 2, that I can't seem to understand, please?

[gabeg]

What if the y's appear more than o nce

[Greenemath]

@bestiies4liifex3

Your welcome, thank you for watching.

[zark]

What if -5, 17, 14, or11 appeared twice?

[markuspiesuckers]

@tutoringecon had this exact question, and a test tomorrow lol