Question about Texas Instruments TI-84 Plus Calculator

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Is there a way to search a table for a specific value of x or y on the TI-84 Plus. For example, if I graph a function and want to know the y value for this function is when x=1000, is there an easier way to find this value than taking the time to scroll all the way down to x=1000 in the table?

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There are two ways you can do that.

Graphically:
Once the graph is drawn you can use the trace function b y pressing TRACE. With the right and left arrows you can move along the curve. The cursor will move by increments of Delta X, so some points you may be interested in may not appear.
To remedy the situation you can just type in a value of X that is inside the range Xmin , Xmax and press ENTER and the calculator will display the corresponding Y value. This will work only for points inside the interval Xmin, Xmax.

NUMERICALLY
To obtain Y-values outside the Xmin, Xmax interval you can use the fact that Y1, for example, is already defined, and ask the calculator to find a Y-value for you.

Say you want Y1 for X=1000.

  1. In main computer screen you type in 1000 [STO

Posted on Oct 05, 2010

  • k24674 Oct 05, 2010

    There are two ways you can do that.



    Graphically:

    Once the graph is drawn you can use the trace function b y pressing
    TRACE. With the right and left arrows you can move along the curve. The
    cursor will move by increments of Delta X, so some points you may be
    interested in may not appear.

    To remedy the situation you can just type in a value of X that is inside
    the range Xmin , Xmax and press ENTER and the calculator will display
    the corresponding Y value. This will work only for points inside the
    interval Xmin, Xmax.



    NUMERICALLY

    To obtain Y-values outside the Xmin, Xmax interval you can use the fact
    that Y1, for example, is already defined, and ask the calculator to
    find a Y-value for you.



    Say you want Y1 for X=1000.


    1. In main computer screen you type in 1000 [STO>] [X, T, theta,n] [ENTER]

    2. Calculator echoes the value 1000.

    3. Press [VARS][right arrow >][Y-Vars][1:Function]

    4. A list of Yx variables is displayed.

    5. Select the one corresponding to the function of interest, say Y1, and press ENTER.

    6. Variable echoes on main screen as Y1.

    7. Press [ENTER] to calculate it at the value you stored in the variable X (1000).

    8. If you want another value, just repeat the steps starting from storing a value in X etc.

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