Reese L.

asked • 11/20/21

write an equation for the ellipse given the center (-1,-1) and the vertices (-1,1) and (-1,-3)

In the graph, the center is two units away from the two ends (major axis) so I figured a=2 and then (h,k + or - a), and the graph is parallel to the y-axis. However without the foci I do not know how to write the equation for the problem since I don't know the answer to b.

1 Expert Answer

By:

Reese L.

what equation would I use to find it?
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11/21/21

Patrick T.

tutor
I am confused by your question. You're asking about an equation to find what, exactly?
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11/21/21

Reese L.

I am supposed to write an equation for the ellipse, Bu I am given the center and the vertices, however, I cannot write the equation if I do not have the value of b I cannot find the equation, so how do I find the answer to b?
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11/21/21

Patrick T.

tutor
I explained how to find b but let me try again... when you look at your graph: what is the distance between the center of the ellipse and ANY of the endpoints on the MINOR axis?
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11/21/21

Reese L.

the minor axis points are (0,2) and (0,0)
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11/21/21

Patrick T.

tutor
So I did a quick drawing. Given the center (-1,-1), vertices at (-1,1) and (-1,-3), the minor axis points being at (0,0) and (0,2) seems inaccurate.
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11/21/21

Reese L.

I am so sorry I was looking at the wrong problem for my minor axis, the minor axis (0,-1) which is the only exact point for the minor axis, but b=1 I have figured out
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11/21/21

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