My datasource is in the format needed for such graphs, is there a way i can connect the data points to look like a line?
First, I would read the following blog:
One key point from the blog is that your date field has to be continuous. Now since we can’t use Measure Names in calculated fields you’re going to need to restructure your data, worksheet 7 from Jonathan's blog, and make a bit taller eg. P4 Questions INTs and Questions on Community as a dimension. Jonathan does this with custom SQL (pre version 9.0) but you can use Tableau’s built in pivot tool.
After that, you can un-stack the bar chart. Detailed instructions provided below. I didn't post a "how to" in the link John gave you because it really depends on your data. I hope you can follow the logic. If not let me know if you need any clarification.
Then it’s just paying attention to what Tableau is doing while you build the viz. Hopefully this is enough to get you started, see attached workbook vs 9.3. If you get stuck then post back with a .twbx and let me know what step did or didn't work.