How to Erase Drawing on the TI-83 Plus
Because the Draw menu on the TI-83 Plus graphing calculator has no Undo feature, the capability to erase is important — and three types of erasing are possible: erase all drawings, erase a portion of a drawing or graph, or erase one or more points from a drawing or graph.
Erasing points from a graph comes in handy when you really want to emphasize that a function is undefined at a certain point.
To erase all drawings: Press [2nd][PRGM] to select ClrDraw from the Draw menu. If the graph is displayed at the time you pressed these keys, the graph will be redrawn without the drawings. If you press these keys from the Home Screen, you also have to press [ENTER] to put the ClrDraw command into action.
To erase a portion of a drawing or graph: The space key ([ALPHA]), which is entered as text, can be used to erase a portion of a drawing or graph. Each time you use this technique, it erases an area about three times as high as the cursor and two times as wide.
To erase one or more points from a drawing or graph: Press
to select Pt-Off from the Draw Points menu. Move the cursor to the point you want to erase and press [ENTER]. Move the cursor to the next point you want to erase and press [ENTER]. When you’re finished erasing points, press [CLEAR].