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Mathematics 17 Online
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?

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

OpenStudy (amistre64):

but how to determine that I cant say for sure

OpenStudy (anonymous):

http://en.wikipedia.org/wiki/Rotation_of_axes

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