Question 1000824

 Function:  A function is a set of ordered pairs in which each {{{x}}}-element has only {{{ONE}}} {{{y}}}-element associated with it.

(8, 1), (-4, 4), (4, 1), (8, 2)=>

the x-element {{{8}}} is paired with a y-element of {{{1}}} and also a y-element of {{{2}}}

so,the relation shown above is NOT a function 



    (4, 4), (-4, 6), (4, 3), (-7, 2)

the x-element {{{4}}} is paired with a y-element of {{{4}}} and also a y-element of {{{3}}}
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 {{{-4}}} is paired with a y-element of {{{3}}} and also a y-element of {{{5}}}
so,the relation shown above is NOT a function