Question

The relation { (8,5) , (-8,-5) , (-4,3) , (4,3) } is not function when which ordered pair is added to the set ?

A. (-4,5)
B. (-5,8)
C. (3,-4)
D. (-3,-8)

Answer 1

If it has the same x value as a point already in the list, it won't be a function

Answer 2

A. -4 is already an x-value in the set which makes it not a function

Answer 3

in other words, for it to be a function, you can't have the same x paired with two different y's

Answer 4

that is correct
a function can be on-to-one or many-to-one bot NOT one-to-many

Answer 5

So the answer is A. b/c it won't be a function