Texas Instruments TI-89 Titanium User Manual page 659

• If you refer to a previously defined
function, any variables used as
arguments in the function call are listed,
not the variables used to define
the function.
• If the equation contains a system variable
( , , etc.), that variable is not
xmin xmax
listed. The solver uses the system
variable's existing value.
You cannot solve for a system
Note:
variable other than exp. Also, if the
equation contains a system variable, you
cannot use ... to graph.
• Although you can use a system variable
in the equation, an error occurs if you use
... to graph the solution.
Numeric Solver
If f(a,b) was defined
previously as
(a^2+b^2) and your
‡
equation contains
f(x,y), then x and y are
listed, not a and b.
In the standard viewing
window, xmax=10.
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