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Find the Rule from a Function Table

Study each input → output table. Write the rule, then use the rule to find the new output.

Example
1 → 3,   2 → 4,   4 → 6,   6 → 8
What is the rule? add 2
What is the output for 8? 10
  1. 1.
    1 → 3,   3 → 5,   5 → 7,   7 → 9
    What is the rule?
    What is the output for 11?
  2. 2.
    5 → 10,   10 → 15,   11 → 16,   12 → 17
    What is the rule?
    What is the output for 14?
  3. 3.
    2 → 12,   3 → 13,   4 → 14,   6 → 16
    What is the rule?
    What is the output for 1?
  4. 4.
    1 → 9,   3 → 11,   4 → 12,   7 → 15
    What is the rule?
    What is the output for 9?
  5. 5.
    2 → 9,   3 → 10,   10 → 17,   11 → 18
    What is the rule?
    What is the output for 16?