I have a sheet that has data in weekly fashion in the first and second rows.  
(Row 1, week: Row 2, data.)  

Is it possible to have a graph populate off of the information in rows 1 and
2 that automatically includes data for new weeks as they are entered in to
the sheet?  

For example, I want to create a graph for weeks 1 through 3 now, and want
the chart to automatically update if I add data for week 4.

Row 1     Week     1          2          3
             Data     12.5      17        18

Thanks for the assist!
-Adam