My Math Forum  

Go Back   My Math Forum > College Math Forum > Calculus

Calculus Calculus Math Forum

LinkBack Thread Tools Display Modes
February 3rd, 2009, 04:16 PM   #1
Joined: Feb 2009

Posts: 1
Thanks: 0

Help plotting points of a paremetric equation...

Hello all!
In my pre-calculus class, we've just begun working with parametric equations. Most everything seems to make perfect sense, except that sometimes our answers don't agree with the calculator. I'm not sure if it's because our teacher didn't teach us this (he tends to leave things out for us to figure out), our book doesn't mention it, or if it's because I just am missing something. Here's an example:

The book gives me:
x = t + 2
y = 1 + 3/t
and then asks me to fill out a chart (essentially a three-columned t-table with t, x, and y) with t-values of -2, -1, 0, 1, and 2. So I end up with:
t = {-2, -1, 0, 1, 2}
x = {0, 1, 2, 3, 4}
y = {-1/2, -2, undefined, 4, 5/2}
Then it tells me to plot the points on a graph. I do this (no point at (2, undefined)), and then check it with a graphing calculator. Everything looks correct, except that there's no points with a t-value of less than 1 on the calculator. The book agrees with me, though.

What exactly is going on? Do I need to change what the calculator calls the "Tstep" to see it all, or is there something I'm missing? Or is the calculator wrong? Or am I just overreacting and need to not bother? Any help? Thanks for anything.
omega234 is offline  
February 3rd, 2009, 06:34 PM   #2
Joined: Dec 2008
From: Washington state, of the United States

Posts: 37
Thanks: 0

Re: Help plotting points of a paremetric equation...

TStep, probably, yes. Make TStep smaller. Zoom in, too.
CogitoErgoCogitoSum is offline  

  My Math Forum > College Math Forum > Calculus

equation, paremetric, plotting, points

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
Finding the equation given 3 points pikachu26134 Algebra 1 November 11th, 2011 09:01 PM
Graphing Linear Equations By Plotting Points horror.mama Algebra 1 June 13th, 2010 05:55 PM
Equation for Plane given 3 points Anonymouse7 Calculus 1 January 27th, 2010 10:38 AM
Plotting moving points in 2d graph FKeeL Algebra 0 September 10th, 2009 07:23 AM
circle equation using three points? karel747 Algebra 4 May 26th, 2008 01:40 PM

Copyright © 2019 My Math Forum. All rights reserved.