anonymous
  • anonymous
WILL GIVE MEDAL IF CORRECT. Determine which relation is a function. A. {(–3, 2), (–2, 3), (–1, 1), (0, 4), (0, 1)} B. {(–3, 3), (–2, 3), (–1, 1), (0, 4), (0, 1)} C. {(–3, 2), (–1, 3), (–1, 2), (0, 4), (1, 1)} D. {(–3, 2), (–2, 3), (–1, 2), (0, 4), (1, 1)}
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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mathmale
  • mathmale
You'll need to understand what distinguishes "functions" from "non-functions." Can you do that? Important to kinow, if you have to identify functions.
anonymous
  • anonymous
no, i'm not sure how to do that. can u explain it?
anonymous
  • anonymous
@adamfolt can u help please?

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anonymous
  • anonymous
I think so one minute
anonymous
  • anonymous
ok thx
SolomonZelman
  • SolomonZelman
By "function" they mean that relation has no more than one y per every x.
anonymous
  • anonymous
okay, so can u help with the question asked?
SolomonZelman
  • SolomonZelman
that is what I am going to attempt. 9(But as you probably know, I am not allowed to just handle answers according to the site's policy))
anonymous
  • anonymous
would the answer be A? since, every other group has 2 of the same y values?
anonymous
  • anonymous
yes I understand that.
SolomonZelman
  • SolomonZelman
So if you had, FOR INSTANCE, (2,3), (2,4) somewhere in your relation. Then for x=2, you have y=3 and y=4. And that means that your relation would NOT be a "function".
mathmale
  • mathmale
When you're trying to identify functions, the important thing is that no x-value has more than one y-value associated with it. Solomon's example is very accurate.
SolomonZelman
  • SolomonZelman
HOWEVER, if your relation involved (again FOR INSTANCE) the following points: (4,5) and (6,5) ... then your relation is a function, because you have x=4 and x=6 for y=5. And that doesn't transgress the requirement; "no more than one y-value per every x" (Saying that you can have multiple x's that correspond to a single y, but NOT the other way around)
anonymous
  • anonymous
so is the answer A or not??
SolomonZelman
  • SolomonZelman
{(–3, 2), (–2, 3), (–1, 1), (0, 4), (0, 1)} A has points; (0,4) and (0,1) so for x=0 you have multiple y-values - y=4 and 1.
SolomonZelman
  • SolomonZelman
Are you allowed to have more than one y-coordinate correspond to a single x-coordinate?
anonymous
  • anonymous
yes, i think so,
SolomonZelman
  • SolomonZelman
I explained that not...
anonymous
  • anonymous
oh yea sorry. its one y coordinate per ever x coordinate
SolomonZelman
  • SolomonZelman
|dw:1450297853271:dw|
SolomonZelman
  • SolomonZelman
therefore, it is NOT a...
anonymous
  • anonymous
it's not a function.
SolomonZelman
  • SolomonZelman
yes it is not "function"
anonymous
  • anonymous
and there's only allowed one point per vertical line?
SolomonZelman
  • SolomonZelman
yes, one point per vertical line. (same as "no more than one y-value per a single x-value)
SolomonZelman
  • SolomonZelman
but, on horizontal line, you can have multiply points.
anonymous
  • anonymous
okay so then would the answer be A??
SolomonZelman
  • SolomonZelman
I thought we just agree that ....
SolomonZelman
  • SolomonZelman
agreed*
anonymous
  • anonymous
so yea?
anonymous
  • anonymous
because that's what I thought too, just making sure though.
SolomonZelman
  • SolomonZelman
|dw:1450298130517:dw|
SolomonZelman
  • SolomonZelman
relation A contained (0,4) and (0,1)
anonymous
  • anonymous
ohhhh now I get it. answer A had 2 points on 1 vertical line and that's not allowed.
SolomonZelman
  • SolomonZelman
yup, that is right...
SolomonZelman
  • SolomonZelman
So which relation does NOT have more than 1 points on a vertical line?
anonymous
  • anonymous
umm can we draw out the points? because i get it but i'm still a little confused.
SolomonZelman
  • SolomonZelman
you don't need to draw, just skim through the options and if you see the x-coordinate repeat then you can exclude that one right away, and move on to next answer choice.
anonymous
  • anonymous
okay, im gonna do it right now one second.
anonymous
  • anonymous
would it be B? or D?

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