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# Graph Question - AQA ISA Watch

1. Hey guys, I'm trying to prepare for an ISA and I just had a query I wanted to ask you about.

Right so, basically I want to know how to draw a line of best fit for certain graphs. It might be really obvious but it's something I really want to clear up.

They often ask you to plot points and draw a line of best fit in an ISA. I was wondering, what happens if they give you points in a specific range but give you much bigger axes. Do you extrapolate the line of best fit all the way down?

I've been looking at different graphs and one in particular is a graph of volume against temperature for example. Let's say there was an experiment where temperature was varied to measure the volume or something.

If AQA asked me to draw a line of best fit through the data, would I only go through the points? Or would I extrapolate it all the way down to the axes (which might be helpful in finding absolute zero).

I'm just worried because I don't want to draw an extrapolated line and lose marks because that extrapolation wasn't suitable (as there was no data there).

Wow, I've rambled on for what is quite a simple question.

TLDR: Do you extrapolate lines of best fit for which there isn't enough data for the given scale for AQA ISA exams?

Thanks.

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Updated: April 17, 2013
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