>Colleen:
If you want integer number solutions for the line, you can set the window accordingly (however if the line doesn't cross the axis at an integer, it won't show up). Here are the numbers to try in the window(I got these numbers from the NCTM conference in St. Louis--TI class):
Xmin=-47
Xmax=47
Xscl=1
Ymin=-31
Xmax=31
Yscl=1
Hope this helps!! Dyan
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