Calculators How do I graph (In TI-89 titanium) where Y is the independent Variable?

[Migkiller]

Right now I'm doing Centroids in my math class. we are given two functions.
X=-y
and
X=2y-y^2.

My question is, how do I graph these two functions on my TI-89 titanium. The Y=editor is displayed as y(x). Is there a way to change it to X(y). I was able to plot it out on paper, but I use my calculator to check my work. Any help is appreciated thanks.

 

[G01]

Off the top of my head, I can't think of any way, but I don't do much graphing with mine. The easiest solution I can think of is (This may be stupid of me to point out, since it's kind of obvious) to replace y with x in the calculator and vice-versa and just keep track of the change of notation in your head?

If there is a way to do what you ask, I'm sure someone here know how to, but I thought I'd point out the "quick and dirty" fix for the problem.

 

[Hurkyl]

A rotation works too: (x, y) --> (y, -x). That way, you can undo the rotation 'by hand'.

 

[JonF]

Right now I'm doing Centroids in my math class. we are given two functions.
X=-y
and
X=2y-y^2.

My question is, how do I graph these two functions on my TI-89 titanium. The Y=editor is displayed as y(x). Is there a way to change it to X(y). I was able to plot it out on paper, but I use my calculator to check my work. Any help is appreciated thanks.

rotate your calculator by pi/2 :)

 

[George Jones]

Right now I'm doing Centroids in my math class. we are given two functions.
X=-y
and
X=2y-y^2.

My question is, how do I graph these two functions on my TI-89 titanium. The Y=editor is displayed as y(x). Is there a way to change it to X(y). I was able to plot it out on paper, but I use my calculator to check my work. Any help is appreciated thanks.

Use PARAMETRIC mode, setting, for example, y = t and x = 2t - t^2.

 

[Migkiller]

I'm trying your guys' suggestion but I still can't replicate the graph. This is the graph I'm trying to produce but I don't need to add the endpoint where both functions intersect.
The graph is located in the link at the bottom page.

http://http://calcchat.tdlc.com/calcchat/printsolution.jsp?roomName=Calculus%208e%207.6%20Ex%2023&artName=se07f01023&chapFolder=07&secFolder=f&solutionPath=http://calcchat.tdlc.com/solutionart/calc8e/

 

[Migkiller]

I messed up on the link sorry. here it is.

http://calcchat.tdlc.com/calcchat/printsolution.jsp?roomName=Calculus%208e%207.6%20Ex%2023&artName=se07f01023&chapFolder=07&secFolder=f&solutionPath=http://calcchat.tdlc.com/solutionart/calc8e/

 

[George Jones]

I'm trying your guys' suggestion but I still can't replicate the graph. This is the graph I'm trying to produce but I don't need to add the endpoint where both functions intersect.
The graph is located in the link at the bottom page.

I can't tell problem you're having. In PARAMETRIC mode, I get the exact graph. I set tstep = 0.05.

 

[jersiq1]

Right now I'm doing Centroids in my math class. we are given two functions.
X=-y
and
X=2y-y^2.

My question is, how do I graph these two functions on my TI-89 titanium. The Y=editor is displayed as y(x). Is there a way to change it to X(y). I was able to plot it out on paper, but I use my calculator to check my work. Any help is appreciated thanks.

You should just be able to use the SOLVE function in the catalog from the main screen.
I can't remeber what menu it is under, it may be ALGEBRA.
SOLVE(X=2y-y^2,y) {ENTER}
The copy the answer into the Y editor. If there are roots, you have to manually enter each root i.e if you want to look at the sq_rt of x you have to input two separate equations

y=sq_rt(x)
and
y= -sq_rt(x)