Which relation is a function?

A.
{(1, 2); (2, 2); (3, 2); (4, 2)}

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

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

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

Question

Which relation is a function?
 
 A.
{(1, 2); (2, 2); (3, 2); (4, 2)}
 
 B.
{(1, 2); (2, 3); (3, 4); (1, 5)}
 
 C.
{(1, 2); (2, 3); (3, 4); (2, 5)}
 
 D.
{(1, 2); (1, 3); (1, 4); (1, 5)}

thefluffmuncher · Answer

i thinks its a

fibonaccichick666 · Answer

So, in order to be a fn, what is the main condition that needs to be met?

thefluffmuncher · Answer

the x vaules do not have to repeat?

fibonaccichick666 · Answer

That is correct, the math-y way to say that is:  The domain only corresponds to one element of the range.

thefluffmuncher · Answer

so then a is correct then

fibonaccichick666 · Answer

yup yup

fibonaccichick666 · Answer

basically, that is the verbal representation of the vertical line test

thefluffmuncher · Answer

ty