Solution 34924: Dots or Lines Appearing on a Graph When Using the TI-83 Plus and TI-84 Plus Family of Graphing Calculators.
Why does my graph have lines or dots through the display on the TI-83 Plus and TI-84 Plus family of graphing calculators?
After graphing a series of dots or lines may
appear through the display. The dots represent the graph's grid and when zoomed
in to a smaller portion of the graph, can appear as solid lines. This option may
be turned on or off by accessing the FORMAT menu.
As an example, graph Y1
= x2 by doing the following:
• Press [Y=].
• In Y1, press
• Press [ZOOM]
• Pressing [ZOOM] 
to fit the function properly on the screen.
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