A line plot is a graph, but not all graph's are line plot's.

Calling a line plot a graph, is a bit like calling an HDMI cable a wire. If you ask for a wire, you may not get an HDMI cable.

Fins,

If you have specific questions about line plot's, ask away. I'll do my best to help. I think this link is pretty good regarding how to make one:

[Link: ellerbruch.nmu.edu]

I'll check back shortly to see if you need anything.