Graphing with ti 89

  • Thread starter jaredmt
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  • #1
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Main Question or Discussion Point

i was wondering if i could graph something like:
2x + 3y = 7
or
3y^2 + 2x^2 -3x +6 = 0

where the function doesnt always start with plain f(x). is it possible to do this on ti 89?
 

Answers and Replies

  • #2
290
2
If y=f(x), then solve for y. If you're asking about things that don't have nice explicit forms, eg a 3rd degree polynomial in y, then yes, the TI-89 can solve those for you.
 
Last edited:
  • #3
Nabeshin
Science Advisor
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Fairly sure you can only graph explicit functions on the TI-89, so like qntty says, you'll have to solve for y (but the TI-89 will do this for you).
 
  • #4
HallsofIvy
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Sometimes, but not always, you can write implicitely defined functions in terms of explicit functions of a parameter. For example, you can graph x2+ y2= 1, a circle, in parametric graphing mode with x= cos(t), y= sin(t).
 
  • #5
jambaugh
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Insights Author
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Now the TI-89 is programmable so you might search the TI site for packages you can upload to expand its capacities or write your own. At worst you can graph the inequality f(x,y) < 0 by iterating over the coordinates on the visible screen and plotting the ones satisfying the inequality. The boundary will then be your curve.
 
  • #6
290
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Yes, if you want to graph an implicit equation without having to first solve for a variable, you could easily write a program to solve it and input it into Y1.
 

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