On a closer view at the top rows of buttons on the TI-83/TI-84 calculator. There should be five set differently from other buttons and they should possess the following labels;
[Y=] [WINDOW] [ZOOM] [TRACE] [GRAPH]
THE THREE BIG PROBLEMS
Sometimes When Graph Seem To Malfunction There Are Three Reasons Which Are;
Graph Function; if the graph is not properly entered it may be a problem.
Graph turned Off; the graphing function might be entered properly but it may not function as desired because it may be turned off.
Window View; if the window view is set on wrong size this could be a problem.
Detailed Here Are Solutions To The Three Big Problem.
Be Sure That The Graph Is Entered Properly;
Press the [Y=] key at the upper side of the calculator. This takes you to the Y= edit screen. You would see something as this.
Plot1 Plot2 Plot3