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Covaring Quantities - Candle Height & Burned Length

Author:
Kien Hwa
This applet allows you to see how two quantities co-vary according to an invariant relationship.
GeoGebra Applet
A candle is burning at a constant rate. When it has burned 30 mm, its height is 75 mm. When it has burned x mm, its height is y mm. How is y related to x?

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