Once you have the plot of your graph(s) there are a number of useful features that you can take advantage of ...
Feature
Useful for...
If you need to sketch an
inverse function, or find
the range or domain of
the inverse function.
Hint: Check the domain
is valid for the inverse,
and that the inverse is
not one-many or
many-many.
Checking the
roots/solutions of an
equation.
Checking the coordinates
of maximum and
minimum points of a
curve.
Checking the coordinates
of points of intersection
between two curves.
Checking the
corresponding
value when finding
coordinates of points
that are on the curve.
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Steps / key presses
Press Lr to get the
function, then choose r again
for INVERSE. If you have more
than one graph plotted, choose
the one you want by using the
BN keys, then l
Press Ly to get the
function, and then choose q
for ROOT.
Select which curve you want the
roots of, then use ! and $ to
switch between roots if there are
more than one.
Press Ly to get the
function, and then choose w
for MAX or e for MIN.
Select which curve you want the
max or min of, then use ! and
$ to switch between stationary
points if there is more than one.
Press Ly to get the
function, and then choose y
for INTERSECT.
Use ! and $ to switch
between points of intersection if
there is more than one, and press
l if you want to see the
coordinate point labelled on the
graph.
Press Ly to get the
function, and then choose u to
y
or
x
go to the next page. Then choose
q for Y-CAL and choose w for
X-CAL.
Select which curve you want a
value from, then type in the
value you want.
Screen
Here is the inverse of the blue
graph, plotted in green...
This was to find the
y
-value when
was equal to 2.25
x
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