Which of the following tables does not represent a function?

x y
-5 1
-3 -2
-1 -5

x y
-5 1
-5 -2
-5 -5

x y
-1 1
-2 1
-3 1

x y
-4 0
2 0
5 7

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?