Which of the sets of ordered pairs represents a function?

A = {(3, −5), (4, 6), (−3, 9), (2, 7)}
B = {(2, 4), (−1, −7), (5, 6), (4, 3)}

Only A
Only B
Both A and B
Neither A nor B

Question

Which of the sets of ordered pairs represents a function?

A = {(3, −5), (4, 6), (−3, 9), (2, 7)}
B = {(2, 4), (−1, −7), (5, 6), (4, 3)}

 Only A
 Only B
 Both A and B
 Neither A nor B

nnesha · Answer

if there is more than one value of x then that is not function

nnesha · Answer

same value ***

piercetheveil47 · Answer

so A is a function?

nnesha · Answer

yes so what about b

piercetheveil47 · Answer

B is not, bc it has the same value of 4 twice

nnesha · Answer

yeah you have to be careful i said if $\color{red}{X}$ values 
so remember order pair have first x and then y like this ( x , y) so now what you think

piercetheveil47 · Answer

are they both functions??

nnesha · Answer

are they $\color{blue}{Both}$ function ? 0;o

nnesha · Answer

|dw:1417067909341:dw|
you don't like y so live it alone just focus on x values 
$\color{green}{Is}$  that function ??