John's wages are proportional to time if every time that we divide wages by time, we get a constant, so we can make the following table:
Time Wages Wages/Time (y/x)
2 18 18/2 = 9
3 27 27/3 = 9
4 36 36/4 = 9
Since Wages/Time is always equal to 9, John's wages are proportional to time.
Answer: John's wages are proportional to time.