As y is the price of the comic book in hundreds of dollars and x is the time in years, to know the cost of the rare comic book after 6 years we have to:
0. Locate the value of 6 in the horizontal axis.
,1. Go up until you meet with the function (blue line)
,2. Go horizontally to the vertical axis and see the value of ,y,.
Following these steps, the value you should find is 9, however, it is measured in hundreds of dollars.
Answer: $900