Question

Explain why a list of ordered pairs represents a non function

Answer 1

If I understand your question correctly, you are to determine the circumstances under which a given list of ordered pairs does not define a function. A function is a rule that assigns exactly one y value to any given x value.

(1, 2), (2,4) is a function because each x value (1 and 2) has exactly one y value (2 or 4) associated with it.

(1, 2), (1,3), (2,4) is not a function, because the x-value 1 has more than one y value (2 or 3) associated with it.