Is the relation shown in the arrow diagram a function? explain Input 1 3 4 3
Output 1 9 16 27
A. yes each input has only one output
B. yes each output has only one input
c. yes each output is the square of the input
D. no the input 3 has 2 outputs

Something can be described as a function if there is only 1 of each number in the input or x.
For example: (9,6) and (9,3) would not be a function because there are two 9’s as the input.

So, for this problem there are two 3’s meaning this is NOT function because there are two outputs for the same number.

Your answer is going to be D.

Horizontal change or the change of x