Consider the following "function puzzle". The table below displays several clues.
| Input: 4, Output: 19 |
| Input: 10, Output: 103 |
| Input: 9, Output: 84 |
| Input: 1, Output: 4 |
| Input: 6, Output: 39 |
| Input: 8, Output: 67 |
| Input: 5, Output: 28 |
Write an equation that represents this puzzle. Let y be your variable for the output, and let x be your variable for the input. Start your answer with "y=".