# Casio 9860 Self-Guided Instructions TABLE-GRAPH Mode

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1 Casio 9860 Self-Guided Instructions TABLE-GRAPH Mode Instructions Screenshots Investigating Algebraic Systems in TABLE and GRAPH Modes One of the real advantages of the Graphic Calculator is the speed at which it can generate tables. Generally speaking tables are rarely used to investigate systems of algebra in traditional lessons because 1) they are traditionally too tedious to generate and 2) activities based upon tables provided on paper tend not to engage students. The speed and interactivity of a Graphic Calculator makes the act of 'looking at the numbers in a table' much more interesting and an obvious precursor to 'investigating the graph'. Vital Buttons for GRAPH Mode: Trace: (SHIFT F1) Tracing usually is the first action performed after drawing a graph. Tracing the graph gives X-Y values at any point. IMPORTANT: In order for Trace to work the 'Coord' setting in SETUP needs to be ON. View Window: (SHIFT F3) This is where the axes are set up. G-Solve: (SHIFT F5) For finding maxima, minima, intersection points, intercepts, X-Calculations, Y-Calculations, etc after generating a graph. Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

2 GRAPH Mode: Setting the graph TYPE: (Not knowing this can be extremely frustrating for beginners) Enter the Graph Function screen by pressing MENU. Then scroll to GRAPH. Press EXE. Delete any pre-existing equations using DEL (F2 then F1) The default setting in both the Graph Function and Table Function screens is 'Y='. However there are other types of graphs that can be entered. The common point of confusion: (This WILL happen to you or one of your students at some stage!) If you want to enter, for example, Y=3X+1 but your screen is set to something different, for example, 'r=' (FigA), then you will need to change the Graph Function screen to 'Y=' (FigC) Experiment with pressing TYPE (F3) then 'r=' (F2) OR TYPE (F3) then 'Y=' (F1) (Figs A and C) Entering Functions: To enter Y=3X+1: A function can be entered on any of the lines offered. (Use the up-down arrows to move the cursor). NOTE: Do not enter either 'Y' or '=' because these already exist.. With the cursor on 'Y1:' enter 3X+1 ie press EXE (FigD) (NOTE: must be used for X in GRAPH and TABLE modes) (not then ) FigA FigC FigD FigE Let's say we want to see where Y=3X+1 intersects with X=5. We will need to change the graph TYPE to enter X=5. Press TYPE (F3) (FigE) FigF Press X=c (F4) (FigF) NOTE: It appears that our first function has disappeared, but one press of the up arrow will find it! FigG Enter 5 then EXE (FigG) Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

3 Setting the Calculator to Draw Graphs: We will need to action two types of settings. Firstly, go to the SET UP (SHIFT MENU) and arrow up to Coord (FigH) Set Coord, Grid, Axes and Label as in FigH. Press EXIT FigH FigI Now we need to set up the axes to match our graphs. We do this through V-Window. Press V-Window (SHIFT F3) and set Xmin and max and Ymin and max as in FigI, ignoring scale, dot and the other settings. Press EXIT. You should be back at the Graph Function screen (Fig G) FigJ Now press DRAW (F6) (FigJ) Of course in this demonstration example the intersection point can be easily determined algebraically. However, by pressing Trace (SHIFT F1) and scrolling we can get close to the intersection point (FigJ-2). Note that the up-down arrows move the cursor between graphs. FigJ-2 To find the exact intersection point we need press G-Solv (SHIFT F5) (FigJ-3) With most sets of graphs ISCT (F5) will display the intersection point. However, in the case of the X=c graph ISCT will not work. (Try it! To redraw the graph press EXIT and DRAW (F6)) FigJ-3 FigJ-4 Because we know the intersection point has an X value of 5, we can perform a Y-Calc to find the intersection point. Press G-Solv (SHIFT F5) then (F6) (FigJ-4) NOTE: It soes not matter if Trace is On or Off. Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

4 Now press Y-CAL (F1) and enter 5 for X (FigJ-5) Press EXE FigJ-5 The intersection point is (5, 16) (FigJ-6) FigJ-6 Inequalities: Return to the Graph Function screen (EXIT) and use SEL (F1) to deselect functions Y1 and Y2, and place the cursor in line 3 (FigK) Entering Y>X: FigK FigL Press TYPE (F3) then (F6) (FigL) FigM Press Y> (F1) and press X using then EXE (FigM) To draw the inequality: Press V-Window (SHIFT F3) and press INIT (F1) (This gives us a 'square grid') Press EXIT You should be back at the Graph Function screen (FigM) FigN Press DRAW (F6) (FigN) Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

5 Finding Intersections of Inequalities: Let's find the intersection between Y>X and Y<2 Using EXIT TYPE (F3) (F6) F2 enter 2 EXE into line 4 (FigO) NOTE: The FigO screen has been 'arrowed up' FigO FigP Press Draw (F6) (FigP) There's hours of playing to be done here!! Try intersections of inequalities using quadratics, cubics, etc. FigQ Finding Max, Min, Intersection Points, Roots, Intercepts: Clear the Function Screen by using F2 and F1 IMPORTANT: Use the TYPE settings to return the screen to Y= (Press TYPE (F3) then 'Y=' (F1) Then enter the functions shown in FigQ FigR Set up the axes in V-Window (SHIFT F3) as in FigR FigS Press EXIT and DRAW (F6) (FigS) Seeing which graph is Y1, Y2, Y3: FigT Trace the graph using SHIFT F1. Then use left-right arrows (to get away from the Y Axis for better viewing). Then use the up-down arrows. The top of the screen will state the function name of each graph. (eg FigT) Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

6 We will now find the MAX of Y2 and the ROOTS of Y1 FigU Press G-Solv (SHIFT F5) then MAX (F2) (FigU) FigV Note in FigU the calculator is 'pointing' to Y1. We want Y2. Press the down (or up) arrow to get to Y2 (FigV) FigW Press EXE (FigW) Predictably we see the Y2 maximum is at (0, 15) FigW-2 Finding the ROOTS of Y1: Press G-Solv (SHIFT F5) then ROOT (F1), arrow to Y1 then EXE (FigW-2) The left root is displayed (X= -3.2) To display the other root, press the right arrow (X=3.2) (FigW-3) Finding Intersection Points: Note there are numerous intersection points with three pairs of line combinations. We will first find the 2 intersection points between Y2= X and Y3=2X+1 Press G-Solv (SHIFT F5) then ISCT (F5) (FigX) Note the calculator is displaying Y1. FigW-3 FigX Press the down arrow. Y2 will show. Press EXE. This has selected Y2. Now Y3 will show. Press EXE again. Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

7 We have now selected both Y2 and Y3. One of the intersection points of Y2 and Y3 is shown (FigY) FigY To determine the other intersection point press the right arrow (FigZ) To return to the first intersection point, press the left arrow. FigZ Practice these procedures by finding the other intersection points. USING TABLE AND GRAPH MODES TOGETHER: The examples below are simple and are used as an attempt to highlight the process of moving from TABLE mode to GRAPH mode and to explain the associated steps. This process is a good protocol to follow for investigating algebraic systems. Having worked through these pages we recommend the interesting algebraic modelling investigations available at Investigating the effect of Radius on the Volume of a Sphere and Cone: Firstly we will generate a table of values. Enter TABLE mode and delete any pre-existing formulae using F2 and F1 Using the button for X enter the formula for the volume of a sphere as shown in Fig1 Press SET (F5) and enter the settings shown in Fig2 Press EXIT and TABL (Fig3) Scroll through the values. Are the values increasing at an even rate? Are they increasing at an increasing rate? What would your students say? How could we investigate the rate of increase from the table? We could take some numbers and operate on them in RUN mode but let's draw the graph. In order to generate a graph we need to set up the axes. TABLE mode is a good place from which to set up axes because the numbers we need to use are right there on the screen. We need to set X between 0 16 and Y between To set the axes go to V-Window (SHIFT F3) Fig1 Fig2 Fig3 Fig4 Enter the settings according to Fig4, ignoring the values for scale and dot. Note that -5000, rather than zero, has been used for the Ymin. This is to allow the lower section of the graph to continue to display when the graph is being traced. Press EXIT Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

8 To turn the axes on go to SETUP (SHIFT MENU) and arrow up 3 places. Use F1 to turn axes on if necessary. Set Coord, Grid, and Label according to Fig5. Press EXIT (NOTE: Coord=ON allows the graphs to be traced. Label simply puts an X and Y on the screen) Fig5 Press MENU, scroll to GRAPH and press EXE (Fig6) Fig6 Note that the function we entered in TABLE appears in GRAPH mode. Note also that the graph is not selected. Select the graph using SEL (F1) (Fig7) Fig7 Now press DRAW Turn the trace on by pressing SHIFT F1 (Fig9) An overview of what we will do next: We are going to investigate the ratios of Y values for X values in which the X values are in the ratio 2:1 ie Y (when X=2) Y (when X=1); Y (when X=4) Y (when X=2); Y (when X=6) Y (when X=3); etc. We will find Y values for whole-number X values and transfer these to RUN mode to perform the divisions. In each case we will use the memory function. Performing a Y Calculation: With the trace on as in Fig9 press 2 (Fig10) NOTE: By entering a number with the trace on the calculator readies itself to perform a Y calculation, reading the entry as the chosen X value. Press EXE (Fig11) We can see that Y=33.5 We now need to recall this in RUN mode and store it. Fig9 Fig10 Fig11 Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

10 Remember that Y (at X=2) is on memory A Fig18 So press APLPA A and EXE (Fig18) Once again we see the quotient is 8 (Again, possibly quite surprising to students!) Now repeat for Y(at X=6) Y(at X=3); Y(at X=8) Y(at X=4); Y(at X=16) Y(at X=8) Fig19 You should see that each quotient is 8. The obvious question to ask students is 'Why is the quotient consistently 8?' If we were to continue this investigation it would be wise to investigate another formula with an X^3 term Fig20 Let's consider the volume for a cone: Go to TABLE first and deselect Y1 using F1. Enter the formula as in Fig19. NOTE: In Fig19 at Y2 we have used the fraction button this time instead of (1 3) We will use the same table setting as last time (X from 0 16 with a step of 1) Press TABL and scroll through to look at the values. (Fig20) Are the values increasing at an even rate? Are they increasing at an increasing rate? What would your students say? What is the highest value for Y? (about 4300) Go to V-Window and set as per Fig21 Now we will go to GRAPH mode and then perform the 'number crunching' in RUN as we did for the sphere. Fig21 Fig22 Go to GRAPH mode. Using SEL (F1) de-select Y1 and select Y2 (Fig22) Fig23 Press DRAW and Trace (Fig23) Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

11 Now to perform the ratio divisions: Fig24 Press 2 and EXE (Fig24) Go to RUN mode. Recall the Y value with ALPHA Y and EXE Commit this to the memory using then (choose a letter) ALPHA A then EXE (Fig25) Fig25 Return to GRAPH, press DRAW then Trace Fig26 Press 1 and EXE (Fig26) Go to RUN Fig27 Press ALPHA A EXE ALPHA Y EXE (Fig27) Repeat for Y (at X=4) Y (at X=2), etc If investigating this with students and they still don't see why we the quotient is always 8 for 'X-cubed expressions, investigating an area formula would be a good next step. We will investigate the area of a circle. Enter TABLE mode, de-select Y2 and enter the circle area formula (Fig28) The last table setting will suffice so press TABL and once again have a look at the Y values. Note the maximum Y=800+ Fig28 Fig29 Go to V-Window and change the settings according to Fig29 Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

12 Fig30 Now enter GRAPH mode. Deselect Y2 and select Y3. Press DRAW and Trace. (Fig30) Fig31 Now the same procedure to perform Y(x=2) Y(x=1) : Enter 2 EXE enter RUN mode press ALPHA Y EXE Press then ALPHA A then EXE (Fig31) Enter GRAPH, press DRAW and Trace Fig32 Enter 1 then EXE Enter RUN press ALPHA A then EXE ALPHA Y EXE Note the result is 4 (Fig32) Repeat for Y (at X=4) Y (at X=2), etc All quotients will be 4 (Then obviously draw out from the students the relationship between the quotient and the X^2 expressions and the quotient and the X^3 expressions) The intent of these TABLE-GRAPH instructions is to give you a 'feel' for what the calculator can do and hopefully for you to realize there are endless situations in which these skills can be utilized in order to give greater meaning to the relationships between a problem, the associated algebra and the related tables and graphs. For further and more advanced information including practice questions refer to the manual 'Mathematics with a Graphics Calculator Casio fx-9860 AU' by Barry Kissane & Marian Kemp, available at Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

13 NOTES: Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

14 Casio 9860 Graphic Calculator Self Guided Instructions TABLE-GRAPH Mode Richard Andrew

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