Of the choices given three are hyperbolas and one is an ellipse.
Eliminate the ellipse.
Of the three remaining hyperbolas, two open right/left, eliminate them.
I need to figure this out before I take my test! HELP!
Here's a link to a picture of the graph: http://i14.photobucket.com/albums/a3...Picture2-9.png
I'm pretty sure a=3, but I'm not sure how to figure out a or c, or the final equation?
My choices are:
a) x^2-y^2=9
b) y^2-x^2=9
c) x^2+y^2=9
d) x^2-y^2=3
How do I figure this out?!
THANKS.