Help , medal and fan!

Which relation is a function?

{(1, 2); (2, 3); (3, 4); (1, 5)}
{(1, 2); (1, 3); (1, 4); (1, 5)}
{(1, 2); (2, 3); (3, 4); (2, 5)}
{(1, 2); (2, 2); (3, 2); (4, 2)}

Question

Help , medal and fan!




 Which relation is a function?


       {(1, 2); (2, 3); (3, 4); (1, 5)}
        {(1, 2); (1, 3); (1, 4); (1, 5)}
        {(1, 2); (2, 3); (3, 4); (2, 5)}
        {(1, 2); (2, 2); (3, 2); (4, 2)}

anonymous · Answer

functions can only have one 'x'

anonymous · Answer

so which one do u thinnk

anonymous · Answer

the points r (x, y)

haseeb96 · Answer

|dw:1429107763482:dw|

adi3 · Answer

how did u get that @Haseeb96

haseeb96 · Answer

what is function?
Let X and Y be the two non empty sets 
and each element of set X has only one image on the Set Y
this relation is called function.

haseeb96 · Answer

by giving options in the question. @Adi3

adi3 · Answer

the last one iguess

anonymous · Answer

Can you help me on a few math questions please

adi3 · Answer

@Haseeb96 whts do u think whts the answer

haseeb96 · Answer

it is necessary for being a function that
1. Every Element of domain or Set X must be used and can only make one image .
2. all the element of Set X has same image .

haseeb96 · Answer

D is the correct answer

haseeb96 · Answer

@thatonechick1  do u have any question ?

adi3 · Answer

yup i get it thnx