Question about Texas Instruments TI-84 Plus Silver Edition Graphic Calculator

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The Line( command on my Calculator does not erase

The Line( command on my TI-84+SE calculator does not erase even though I have the synrtax correct.

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  • ironwizard Nov 17, 2009

    I am using that exact syntax, but my calculator draws the line it was supposed to erase instead. Is my calculator just glitching? Or is there some hidden setting I need to change to allow the line( command to erase a line correctly?



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If your calculator is drawing lines in response to the Line( command, there is no objective reason why it would fail to obey the same command with a different argument.
To make sure we are talking about the same thing, let me restate the correct syntax for both usages.

Line(X1,Y1,X5,Y5) draws a line joining the points A(X1,Y1) to point E(X5,Y5).
With the foregoing line already drawn, running the command
Line(X3,Y3,X4,Y4,0) will erase the segment of the already drawn line that lies between the points C(X3,Y3) and D(X4,Y4)

  1. To be sure to obtain the intended effect, draw your graph and press [2nd][QUIT] to go to the main calculator screen.
  2. Then you press [2nd][CATALOG] L to jump to the first command that starts with L.
  3. Find the Line( command and press [ENTER].
  4. The command echoes on main screen.
  5. Complete the command by supplying the coordinates of the points, the 5th argument 0 if needed for erasure, and press [ENTER].
  6. The graph is redrawn with the relevant segment missing.

In this exemple it is understood that the points C and D belong to the line drawn. The erasing is effected by the additional argument with value 0. If the points are not on the line, the segment erased may be shorter and may even be of length 0 (no erasure).

If the command still misbehaves, you may have to use the [2nd][DRAW][1:ClrDraw] to clear the drawing and start again.

I trust you will forgive me for all this information that you already know, but I am thinking about other visitors who might not know how to use the command correctly.

Hope it helps.

Posted on Nov 16, 2009

  • k24674 Nov 18, 2009

    I do not know what to tell you. You say you are using the right syntax. There is no hidden configuration setting.

    Erase all graphs with [2nd][DRAW][1:ClrDraw] and try
    Line(0,0,3,6,0) and you will see that it draws nothing: The graph remains blank (except for the axes). yhat is what mine does.

    Remove the last zero from the command line and it will draw a segment between (0,0) and (3,6)
    If you still have problems, you may want to reset the calculator by
    [2nd][MEM][7:Reset][1:All Ram][2:Reset][ENTER][ENTER]

    If all else fails, contact TI by email at



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