Identify domain and range of the given relation. Is it a function?

The correct answer is: Range = {-3.5,-1.5,1.5,3.5,7.5}

We have given some points of a function

(-2,-3.5) , (0,-1.5) , (5,1.5) , (3,3.5), (9,7.5)
The first components of all given points are

-2, 0, 5, 3, 9

Domain = {-2, 0, 5, 3, 9}
The Second components of all given points are

-3.5,-1.5,1.5,3.5,7.5

Range = {-3.5,-1.5,1.5,3.5,7.5}