I don't know what "extend the quadrants" means.

If using a trendline is to make sense, you should probably be using an XY
chart, not a line chart. You can format an XY chart so lines connect the
points.

To extend the trendline in either direction, double click on it, and on the
Options tab, increase the value in the Forecast boxes.

- Jon
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Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
Peltier Technical Services, Inc. - http://PeltierTech.com
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"Chelsea" wrote in message
...
I am making a line graph for school. But I need to extend the quadrants,
and
extend the treadline back, how do I do this?