Determine if the following relation describes a function

The correct answer is: Not a Function

not a function is a correct choice
Not a function because
x-value -2 has two y-values (3.0 and 3.5) paired with it.
for the relation to be a function, then no two output values comes from the same input value

A function is a relation which describes that there should be only one output (domain) for each input (range)
for the relation to be a function, then no two output values comes from the same input value