Explanation:
To find the rule that describes the relationship between the input and the output, we need to analize what is the change in the input to get the output.
For example, for the first row, we can say that the output is equal to the input plus 9 or:
Output = Input + 9
11 = 2 + 9
11 = 11
Then, this rule also apply to the other rows, so:
12 = 3 + 9
