PC Graphing Calculator Day 2 Applications



AP Calculus Graphing Calculator Reference

Graphing an equation of the form y =

Hit y = . Clear any equations that are stored on the screen; then enter your function(s). When your equation has been entered, hit GRAPH . Note: If any of your statistical plots are turned on, then it will confuse the calculator and/or try to graph data points as well. Turn off a plot by using the up arrow to select Plot 1, for instance, then pressing ENTER.

Adjusting your viewing rectangle

You can adjust your window in 2 ways. You may hit WINDOW and manually enter the x and y values that you would like; or you can use the ZOOM button and play with zooming in, out, boxing, or fitting. The last entry in the zoom menu is zoomfit, which should select a window that will accommodate your graph, but I find that it is inconsistent.

Tracing along a curve

While in the graph screen, hit TRACE. The cursor will always be flashing on the y-intercept of your graph and will display the x- and y-coordinates of that point. Use the right and left arrows to trace along the curve.

Find the value of y, given a specific value of x

On the graphing screen, hit TRACE; then enter the x value that you are given. On the home screen, hit VARS, then select Y-VARS, then Function. Now choose Y1. The Y1 will be displayed on your home screen. Now enter the value of x in a parentheses and hit ENTER. For example, Y1(3) evaluates the function when x = 3.

Finding the zeros (x-intercepts) of a curve from the graph

From any screen, select CALC using 2nd TRACE. Select option2: zero by typing a 2, then ENTER, or arrowing down to that line. Use the arrow to move the cursor to the left of the desired zero, then ENTER. Now move the cursor to the right of the desired zero and ENTER. Repeat the process for additional zeros.

Finding the intersection point between two curves

From any screen, select CALC using 2nd TRACE. Select option 5: intersect by typing a 5, the ENTER, or arrowing down to that line. Move the cursor to the vicinity of the desired intersection point and hit ENTER 3 times. The intersection point will be displayed.

Entering a table of values into lists 1 and 2 (L1 and L2)

Hit STAT, then select EDIT. Clear any data in the two lists by highlighting the top line (L1 or L2), then typing CLEAR, followed by the down arrow. Enter the data in the two lists, typing ENTER between each entry. To delete an entry, highlight the entry, then press DEL.

Plotting the data points

Turn on Plot 1 by hitting 2nd Y = to get to the STAT PLOT menu. Select 1 by pressing ENTER; then turn on the plot by selecting it. Adjust any necessary info on this screen. Press GRAPH to plot the data points. You may need to adjust your window.

Finding an equation of a curve that passes through a set of points (a regression)

After entering the data in L1 and L2, hit STAT, then select CALC. now choose which type of regression you’re looking for: LinReg is linear, QuadReg is quadratic, etc. When your regression name is displayed on the home screen, press ENTER. The calculator will automatically take the data form L1 and L2. If you have your data in different lists, then you must type them, separated by a comma, after the regression name. For example: QuadReg L3,L4* L3 is found using 2nd 3 , L4 is 2nd 4 , etc. The comma is right above the number 7. Then ENTER

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