Is [ (1,2), (2,5), (3,8), (2,-5), (1,-2) ] a function if not why not

Answer: No

Step-by-step explanation: A function is a relation in which each x-term corresponds to exactly one y-term.

The easiest way to tell whether or not this relation is a function is to look at the x-coordinates of the given ordered pairs.

If any of the ordered pairs in this relation have the

same x-coordinate, then the relation is not a function.

Notice that two of the ordered pairs have the same x-coordinate.

They are (2,5) and (2,-5).

Since each x does not pair with exactly one y,

we know that this is not a function.