celinegirl
  • celinegirl
Is the following relation a function? (math question)
Mathematics
katieb
  • katieb
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celinegirl
  • celinegirl
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celinegirl
  • celinegirl
Yes No
celinegirl
  • celinegirl

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Hero
  • Hero
Does it pass the vertical line test?
Hero
  • Hero
celinegirl
  • celinegirl
@chris00 oh okay
anonymous
  • anonymous
if we use the vertical line test, |dw:1444447025149:dw| etc, we see that the relation is not a function since it must intersect a x-coordinate at only one y-coordinate
celinegirl
  • celinegirl
@chris00 hm.. I dont understand
anonymous
  • anonymous
if we put a vertical line at say x=3 , then the line intersects two points.
anonymous
  • anonymous
correct?
celinegirl
  • celinegirl
anonymous
  • anonymous
since the vertical line intersects the relation twice, then it is not a function. perhaps look at this link http://www.regentsprep.org/regents/math/algtrig/ATP5/LFunction.htm
anonymous
  • anonymous
Function: A function is a set of ordered pairs in which each x-element has only ONE y-element associated with it.
anonymous
  • anonymous
at x=2, we see that it can take two points. the positive y value and the negative y value. right?
celinegirl
  • celinegirl
@chris00 right
anonymous
  • anonymous
So this means that this relation is not a function.
celinegirl
  • celinegirl
@chris00 ah okay! I get it now.
anonymous
  • anonymous
: )
celinegirl
  • celinegirl
@chris00 thank you!(:
anonymous
  • anonymous
medal and fan if you need my assistance again : )
celinegirl
  • celinegirl
@chris00 of course (: thanks

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