HP 39g+ - Manual (Page 61)

Aplets and their views 2-21
Example: plotting a circle
Plot the circle, x
2 + y 2 = 9. First rearrange it to read
.
To plot both the positive and negative y values, you need
to define two equations as follows:
and
1. In the Function aplet, specify the functions.
Select
Function
9
9
2. Reset the graph setup to the default settings.
SETUP - PLOT
CLEAR
3. Plot the two functions
and hide the menu so
that you can see all the
circle.
4. Reset the numeric setup to the default settings.
SETUP - NUM
CLEAR
y 9 x
2
– ± =
y 9 x
2
– = y 9 x
2
– – =