HP 40G manual Example plotting a circle, $3/7@ Select, +,7@√@9

Example: plotting a circle

Plot the circle, x2+ y2 = 9. First rearrange it to read

y= ± 9 – x2 .

To plot both the positive and negative y values, you need to define two equations as follows:

y= 9 – x2 and y = – 9 – x2

1.In the Function aplet, specify the functions.

>$3/(7@ Select

Function 67$57_

>6+,)7@√￿>￿@￿9

>￿@>;￿7￿5@>;￿@>￿@>(17(5@ >￿￿￿@￿>6+,)7@￿√￿>￿@￿9 >￿@>;￿7￿5@￿ >;￿@>￿@>(17(5@

2.Reset the graph setup to the default settings.

>6+,)7@SETUP-PLOT

>6+,)7@CLEAR

3.Plot the two functions and hide the menu so that you can see all the circle.

>3/27@0(18_￿0(18_

4.Reset the numeric setup to the default settings.

>6+,)7@SETUP-NUM

>6+,)7@CLEAR

5.Display the functions in numeric form.

>180@

2-20 Aplets and their views