Question: A point is moving on the graph of 4x2 + 9y2 = 36. When the point is at (3,0), its y coordinate is decreasing by

A point is moving on the graph of 4x2 + 9y2 = 36. When the point is at (3,0), its y coordinate is decreasing by 2 units per second. How fast is its x coordinate changing at that moment?

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