extrapolating a graph

[Peter]

I want to create a linear graph with only a few points plotted, but with the
graph axes extended on both x and y, so that the students can then manually
extrapolate the smaller (plotted) line on the extra graph paper shown. Any
ideas?

 

[Bernard Liengme]

Right click the x-axis; use Format Axis; open scale tab and set lower limit
to some value.
Repeat with y-axis if needed.
Charles' Law maybe?