TI-84 CALCULATOR GUIDE

How to graph an equation on a TI-84

Enter a quadratic in Y=, draw its graph, and check the display on a physical TI-84 Plus or Plus CE. Follow the keys and expected results.

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Graph a functionFix the windowFind roots

These three guides cover function graphing, viewing windows and graph zeros. Key names are shown as printed on the calculator; screen layouts can vary with software versions.

Before you start: function mode

Press MODE. Use the arrow keys to select FUNC (Func on some versions) and press ENTER. Press 2nd, then MODE (QUIT) to leave the menu. These examples use ordinary function graphing. Preserve any work you need before changing entries or settings.

Draw a function

0 of 4 steps marked done

  1. 1

    Prepare the function editor

    Y=ENTER

    Open Y=. Preserve any entries you need and use an unused Y line; this example uses Y₁. To turn unrelated functions off, move to their highlighted = signs and press ENTER. If any Plot labels at the top are highlighted, move to them and press ENTER to turn them off.

    What you should see

    An available Y line is enabled. Unrelated functions and statistical plots are off.

  2. 2

    Enter the function

    X,T,θ,nx²−4

    On your chosen line, enter X² − 4. Use X,T,θ,n for X and the subtraction key − between X² and 4. Check that the = sign on this line is selected.

    What you should see

    Your enabled Y line contains X² − 4.

  3. 3

    Show the graph

    ZOOM6:ZStandard

    Press ZOOM and choose 6:ZStandard. This sets both axes from −10 to 10 and draws the graph.

    What you should see

    An upward-opening parabola, with its lowest point at (0, −4).

  4. 4

    Read a point

    TRACE←→

    Press TRACE and move left or right along the curve. The displayed X and Y coordinates describe the point under the cursor. Cursor values may be approximate.

    What you should see

    At X = 0, Y = −4. The curve crosses the x-axis near X = −2 and X = 2.

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How to Graph on a TI-84 Plus & Plus CE | HowSolve