What is the condition for Ax2+Cy2=1Ax^2 + Cy^2 = 1Ax2+Cy2=1 to be an ellipse?
A>0,C>0A > 0, C > 0A>0,C>0
A>0,C<0A > 0, C < 0A>0,C<0
A<0,C<0A < 0, C < 0A<0,C<0
Either A or C is 0