Question

I need help on Graphing Ellipses
x^2/9 + y^2/1 = 1

Answer 1

if the equation is in the form:
\[\frac {(x-h)^2}{a^2}+\frac{(y-k)^2}{b^2}=1\]
then it is easily graphed.
the center is (h, k)
a is the distance from your center to the endpoints of your major axis (vertices)
b is the distance from your center to the endpoints of you minor axis (co-vertices)
c is the distance from your center to the foci.

Answer 2

your equation can be written in that form as:

(x-0)^2/3^2 + (y-0)^2/1^2 = 1
so your center is at the origin;
a = 3
b = 1
and here's the graph: