Precal Slides for 3-1 (1).pdf -...

Precal S2 Day 36 ­ Plane Curves & Parametric Models.notebook
1
March 01, 2018
Memory Quiz #8
Get out one clean sheet of paper and a pencil, and be ready to start
Memory Quiz #8 at the bell.
You will need a calculator today, so if you do not have one, please
check one out while I am checking homework.

Precal S2 Day 36 ­ Plane Curves & Parametric Models.notebook
2
March 01, 2018
Parametric Functions & Plane Curves
Last time, we defined parametric equations as a pair of functions for x
and y given in terms of the parameter t .
To change an equation from parametric form to rectangular form:
•
Solve the simpler equation for t (if you can't tell which is simpler, just
use the x equation)
•
Substitute the result for the t in the other equation
•
Simplify (and isolate y if possible)
There are usually multiple ways to write a pair of parametric equations for
a given rectangular equation. The simplest way to write a pair of
parametric equations for a function of y in terms of x is to make one
equation x = t , and then substitute t for x