Which of the sets of ordered pairs represents a function?

A = {(−4, 5), (1, −1), (2, −2), (2, 3)}

B = {(2, 2), (3, −2), (9, 3), (9, −3)}

Answers:
Only A
Only B
Both A and B
Neither A nor B

Question

Which of the sets of ordered pairs represents a function?

A = {(−4, 5), (1, −1), (2, −2), (2, 3)}

B = {(2, 2), (3, −2), (9, 3), (9, −3)}

Answers:
Only A
 Only B
 Both A and B
 Neither A nor B

darkknight · Answer

Do you know what makes up a function?

ElementIron67 · Answer

I think it said it in my lesson

darkknight · Answer

Lets try graphing the points on desmos. This is the first graph https://www.desmos.com/calculator/bgfm8jlkmo

darkknight · Answer

Do you notice anything wrong with this graph?

ElementIron67 · Answer

uhm

darkknight · Answer

While a function may NOT have two y-values assigned to the same x-value, it may have two x-values assigned to the same y-value. As you can see there are 2 y's assigned to the same x

darkknight · Answer

So the first one is not a function

ElementIron67 · Answer

ok

darkknight · Answer

Now lets look at the second one This is the second one https://www.desmos.com/calculator/csw6ysjjjn What do you see wrong with this?

ElementIron67 · Answer

I also have a meeting with my teacher in 30min

darkknight · Answer

Yes okay, you will be fine. Do you understand what I told you?

ElementIron67 · Answer

kinda

darkknight · Answer

And what do you see wrong with the second graph?
Hint: it is kind of like the same situation as the first graph

ElementIron67 · Answer

2,2?

darkknight · Answer

Thats not what I mean. As you can see in the in the first graph. The first one was not a function because it had 2 y values assigned to the same x-value. Look at the second graph. Do you notice anything similar?

darkknight · Answer

Still with me?

ElementIron67 · Answer

yea

darkknight · Answer

So why is B not a function?

ElementIron67 · Answer

This is a leap for me because I went from a public school last year, to homeschooling this year. My parents put me in 7th adv math, when im supposed to be in 4th math

darkknight · Answer

Hmm, how old are you?

ElementIron67 · Answer

9

darkknight · Answer

And we might have a problem if you have skipped 3 years of math and don't know how to do this stuff

ElementIron67 · Answer

I did a bit in tutoring, but corona ruined it

darkknight · Answer

Okay, so do you know what a function is?

ElementIron67 · Answer

not really ;(

darkknight · Answer

Okay I am kinda mad, I was typing a paragraph and the whole thing got deleted

ElementIron67 · Answer

oof :(

ElementIron67 · Answer

This is the closest thing I could find to the video they gave me https://www.youtube.com/watch?v=tAoe4xjUZQk (Im homeschooled)

darkknight · Answer

So It is really hard to understand all this stuff if you don't have the core down. It would be hard for us to teach you all this stuff so I would recommend going onto youtube and watching videos on what functions are and things like that. Skipping 3 grades in a single jump is hard and I uderstand that but it might take you a while to get caught up, and that is the only way I see it. You have to persist to do good. Even better, I recommend going onto Khan academy and watching videos so you get caught up. Lastly since you are underage you can't be on this site, sorry. Come back when your 13 :)

darkknight · Answer

And yes, that is a nice video to watch!

ElementIron67 · Answer

ok!

ElementIron67 · Answer

thank you for the help

ElementIron67 · Answer

I have to get to my meeting

darkknight · Answer

Cya

ElementIron67 · Answer

bye