Chapter 7: Parametric Graphing 127
07PARAM.DOC TI-89/TI-92 Plus: Parametric Graphing (English) Susan Gullord Revised: 02/23/01 10:56 AM Printed: 02/23/01 2:13 PM Page 127 of 6
Chapter 7:
Parametric Graphing
Preview of Parametric Graphing..........................................................128
Overview of Steps in Graphing Parametric Equations..................... 129
Differences in Parametric and Function Graphing........................... 130
This chapter describes how to graph parametric equations on the
TI-89 / TI-92 Plus. Before using this chapter, you should be familiar
with Chapter 6: Basic Function Graphing.
Parametric equations consist of both an x and y component, each
expressed as a function of the same independent variable t.
You can use parametric equations to model projectile motion. The
position of a moving projectile has a horizontal (x) and vertical
(y) component expressed as a function of time (t). For example:
The graph shows the path of the projectile over time, assuming
that only uniform gravity (no drag forces, etc.) is acting on the
projectile.
7
x(t) = v0t cos q
y(t) = v0t sin q – (g/2)tñ(x(t),y(t))