Using Graphs & Geometry 87
3. Type the rest of the inequality expression.
Press· to graph it.
The expression, as typed, displays next to the graph. Shading is
always present on the graphs of inequalities to show the values that
satisfy the inequality. If you graph two inequalities that overlap, the
area of overlap is shaded darker than either of the individual
inequality graphs.
Finding points of interest: zeroes, minima, maxima
When you create a graph, you can use the Point On tool ( ) (press
b62) to locate the zeros, minima, and maxima if these are
applicable for objects on the work area. (They may not display if their
location on the graph not visible on your screen.) Both local and global
points of interest display.
Note: Global points of interest display only when they are also local. For
example, inverse sine reaches its (global) maximum at x=1, but the
tooltip 'M' does not display there since it is not a local maximum.
To find them, just move the point along the object or graphed line, and
when you are near a point of interest, the coordinates display along with
one of the following identifiers:
• Zeroes: z ( Coordinates )
• Minimum: m ( Coordinates )
• Maximum: M ( Coordinates )
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