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

Input
(x) 5 6 7 8
Output
(y) 2 5 8 11

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) = 2x + 13. Which relation has a greater value when x = 7?

Part C: Using the relation in Part B, what is the value of x if f(x) = 75?