Question

Which relation is a function?

Answer 1

B, because for every one you take away from the x value, you add one to the y value

Answer 2

Answer: Option B

Step-by-step explanation:

A function has a rule, for each point in the domain, there can be only one point associated in the range.

This means that f(x) can have only one value y that is associated to the point x in the domain.

now, with this in mind, let's analyze the options, where the pairs are always written as (x, y)

A) Here we can see the pairs (2,3) and (2, 7), so we have the point in the domain, 2, that is associated with two different values in the range, so this relation can not be a function.

B) In this set, there are no problems because we do not have ani point in the domain with more than one value in the range, so this can be a function.

C) here point 11 has two different values in the range, so this can not be a function.

D) here point 3 has two different values in the range, so this can not be a function.