TI-83 Plus Parametric Graphing 159
In this editor, you can display and enter both the X and Y components of
up to six equations, X1T and Y1T through X6T and Y6T. Each is defined in
terms of the independent variable T. A common application of parametric
graphs is graphing equations over time.
Selecting a Graph Style
The icons to the left of X1T through X6T represent the graph style of each
parametric equation (Chapter 3). The default in Par mode is ç (line),
which connects plotted points. Line, è (thick), ë (path), ì (animate), and í
(dot) styles are available for parametric graphing.
Defining and Editing Parametric Equations
To define or edit a parametric equation, follow the steps in Chapter 3 for
defining a function or editing a function. The independent variable in a
parametric equation is T. In Par graphing mode, you can enter the
parametric variable T in either of two ways.
• Press „.
• Press ƒ ãTä.
Two components, X and Y, define a single parametric equation. You
must define both of them.