Question

Which ordered pair could you remove from the relation {(–2, –1), (–1, 1), (–1, 0), (0, 1), (1, 0)} so that it becomes a function?

Answer 1

One of the requirements of a function is that each input only has one output.
In this case, you can think of the x-coordinates as "inputs" and the y-coordinates as "outputs".
Can you see any of the pairs where the same "input" has more than one "output"? One of those would need to be removed for this collection of pairs to be considered a "function".

Answer 2

(–1, 1) or (–1, 0)


(–1, 1) or (0, 1)


(0, 1) or (1, 0)


(–2, –1) or (–1, 1)

Answer 3

Would it be A

Answer 4

I'll put it this way, do you notice that any of the x-coordinates are used more than once?

In fact, this does occur with answer choice A, so I think you've got your answer there!

Answer 5

Thank you!

Answer 6

No problem, good job figuring it out :)