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February 3rd, 2009, 05:16 PM   #1
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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:
Code:
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:
Code:
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, 07:34 PM   #2
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Re: Help plotting points of a paremetric equation...

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