Question

Find the vertices, foci and eccentricity of the ellipse.
9x^2 + y^2 = 81

Answer 1

Rewrite it in standard form.

Answer 2

You don't need me when you have polpak :)

Answer 3

\[\frac{(x-h)^2}{a^2} + \frac{(y-k)^2}{b^2} = 1\]

Answer 4

You should divide both sides by 81, you will have:
\[{x^2 \over 9}+{y^2 \over 81}=1\]

Answer 5

Then rewrite 9 and 81 as the square of a and b, then you know the lengths of the major and minor axes.