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Elliptic exercises as an elective course in mathematics
The general equation of the elective course 2- 1 ellipse in senior two mathematics is X 2/A 2+Y 2/B 2 = 1.

A is the largest ellipse, so the numerator with a 2 as the denominator is X 2, and the focus is on the X axis. If the molecule is y 2, the focus is on the y axis. (that is, the denominator is x 2, the focus is on the x axis, and so is the y axis).

The a of the ellipse is not necessarily on the x axis. An ellipse has a long axis and a short axis, and A is generally on the long axis.

If you don't understand, you can ask, please adopt.