Question 1000824: Which of the following relations is a function?
(8, 1), (-4, 4), (4, 1), (8, 2)
(4, 4), (-4, 6), (4, 3), (-7, 2)
(4, 4), (-4, 2), (8, 1), (-7, 2)
(4, 0), (-4, 3), (8, 1), (-4, 5)
Answer by MathLover1(20850)   (Show Source):
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Function: A function is a set of ordered pairs in which each  -element has only   -element associated with it.
(8, 1), (-4, 4), (4, 1), (8, 2)=>
the x-element  is paired with a y-element of  and also a y-element of 
so,the relation shown above is NOT a function
(4, 4), (-4, 6), (4, 3), (-7, 2)
the x-element  is paired with a y-element of and also a y-element of 
so,the relation shown above is NOT a function
(4, 4), (-4, 2), (8, 1), (-7, 2)
none of the x-element is paired with a more than one y-element;so,the relation shown above IS a function
(4, 0), (-4, 3), (8, 1), (-4, 5)
the x-element  is paired with a y-element of and also a y-element of 
so,the relation shown above is NOT a function
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