Question

From the set of ordered pairs A = {(x,2),(-5,7),(3,-4)} what must be the value of X so that the set represents a function.

Answer 1

a function does not have the same x with 2 different y values

so, for example, (2,1) and (2,3) is not allowed because x=2 is paired with y=1 and y=3 , and that is not allowed.

Answer 2

for your problem, x can be a lot of different numbers, but it can't be some specific numbers, because then you would get a repeated x with different y values

Answer 3

Thanks mate