The table shows the outputs, y, for different inputs, x: Input (x) 2 5 9 12 Output (y) 20 15 12 8 Part A: Do the data in this table represent a function? Justify your answer. Part B: Compare the data

The table shows the outputs, y, for different inputs, x:

Input (x) 2 5 9 12

Output (y) 20 15 12 8

Part A: Do the data in this table represent a function? Justify your answer.

Part B: Compare the data in the table with the relation f(x) = 5x + 14. Which relation has a greater value when x = 9?

Part C: Using the relation in Part B, what is the value of x if f(x) = 64?