# Graphing an ellipse on TI-nspire CX CAS

How do I graph an ellipse on a TI-nspire CX CAS?

I know how to graph an ellipse with the equation $$\frac{(x-h)^2}{a^2} + \frac{(y-k)^2}{b^2 }=1$$

but I don't know how to put coefficients in the equation on the calculator. For example, how do I graph the ellipse with equation $$x^2 + 2y^2 = 1$$

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is this on-topic? Shouldn't this be on the particular calculators manual or something? – Sabyasachi Mar 12 '14 at 20:30
You could just graph $y = \pm\sqrt{(1 - x^2)/2}$ seperately – Nameless Mar 12 '14 at 20:45
@Sabyasachi No, I've looked in the manual and online and found nothing. – allie Mar 14 '14 at 20:31

Go the graph screen, then press the menu button. Press 2:Equation, then 6:Conic.

It will allow you to enter the coefficients of the terms.

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Go the graph screen, then press the menu button. Press 2:Equation, then 4:Ellipse.

Edit: Set the denominators to 1, and h and k to 0.

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Right, I know how to do that. But how do I put the coefficient in front of the $y$? – allie Mar 14 '14 at 20:32
I don't think you can do that directly, but you can set b to $\sqrt{\frac{1}{2}}$ – russCam Mar 14 '14 at 22:10

So with the new software update, lots of things have changed. Turn on calculator. Hit B to go to graph. Hit menu, 3,2 to go to relation. Type in equation $$(x−h)^2/a^2+(y−k)^2/b^2=1$$ as shown above.

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