Question

Is this a function or non-function {(3,4),(4,-6),(5,-7),(3,2),(-2,5)}

Answer 1

Recall that a set of ordered pairs A represents a function if:

$(x,y),(x,z)\in A\text{ if and only if y=z.}$

Now, notice that (3,4) and (3,2) are in the given set of ordered pairs, since

$4\ne2$

we get that the given set does not correspond to a function.

Answer: Non-function.