Posted by dcw on Thursday, March 25, 2010 at 11:21am.
How do i know if a conic section is a circle, ellipse, hyperbola, or parabola? based on it's equation such as 4x^2  y^2 + 24x + 4y + 28 = 0

precalculus  Reiny, Thursday, March 25, 2010 at 11:34am
General equation:
ax^2 + by^2 + cx + dy + e = 0
1) if a = b > circle
2) if both a and b are positive, but different, > ellipse
3) if a is positive and b is negative, > hyperbola
4) if either a or b, but not both, are zero > parabola
5) if both a and b are zero > straight line
so yours is a hyperbola

precalculus  trey, Friday, March 26, 2010 at 10:26am
Find the transformed equation of the hyperbola xy = 4 when rotated 45?

precalculus  dcw, Friday, March 26, 2010 at 11:09am
Thanks reiny. This helped a lot.
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