If you need to add (or remove) check marks, scroll to the space on the left of the “y=”, then press F4 to select/deselect. Those indicate which functions should be graphed. In the Y=editor, look for check marks to the left. If your problem is not being able to graph correctly (or at all), this is usually due to a setting in the Y=editor. Something stored (like a variable) is preventing the calculator from performing the requested action.You’ve made a typo, or forgot to include something (like a closing parentheses),.TI-89 Error codes pop up for one of two reasons: Feel like "cheating" at Calculus? Check out our Practically Cheating Calculus Handbook, which gives you hundreds of easy-to-follow answers in a convenient e-book.
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