__Category__: Analytic Geometry, Algebra"Published in Newark, California, USA"

Find the equation of an ellipse if the center is C(1, 3), vertex is V(1, -1), and passing through the origin.

__Solution__:

To illustrate the problem, let's draw the graph as follows

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Since the major axis of an ellipse is parallel to y-axis, the equation of an ellipse in standard form is

But C (1, 3), the above equation becomes

Since one of the vertex of an ellipse is given, we can solve for the value of a as follows

Substitute the value of a to the above equation

Therefore, the equation of an ellipse in standard form is

You can express the equation of an ellipse in general form by expanding the above equation as follows