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OpenStudy (anonymous):
How to eliminate the xy term in Ax^2 + Bxy + Cy^2 +Dx + Ey + F = 0 (B not 0, obviously) by making a suitable rotation?
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OpenStudy (amistre64):
i was gonna say rotate it lol
OpenStudy (amistre64):
determine the slope between your foci if its elliptic or hyperbolic
OpenStudy (amistre64):
i never did learn the technical steps for it tho
OpenStudy (anonymous):
Maybe I need to be more concrete: 19x^2 + 6xy + 11y^2 -40 = 0 What's the rotation to get rid of the xy?
OpenStudy (amistre64):
the graph looks to indicate a rotation of 45 degrees
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OpenStudy (amistre64):
but how to determine that I cant say for sure
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