Question

Which of the following relations represents a function?

Answer 1

Answer:

D

Step-by-step explanation:

Each function needs to have a unique output... i.e: plugging in a value for x, you get a unique value of y. D is the only one where that occurs :)

Answer 2

Answer:

A

Step-by-step explanation:

A is the only one that has an x-value that has a unique y-value. C b and d have multiple x-values that have multiple y-values. For example, c has an x-value of 1 which has 2 outputs, which are 3 and 4.