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1.Suppose x, y and z represent three quantities. When a variable quantity is proportional to the product of two or more variables, we say that it varies jointly. For example, the equation y = kxz means that y varies jointly with x and z. When direct and inverse happen at the same time it is called combined variation.

2.Joint variation is just like direct variation, but it involves two or more variables: y=k(xz). Combined variation is a combination of direct and inverse variation: y=kx/z.

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