3.3 Joint Variation

A combination of direct and inverse variations of one or more than one variables forms joint variation.

If a variable $y$ varies directly as $x$ and varies inversely as $z$ .

Then $y \propto x$ and $y \propto \frac{1}{z}$

In joint variation, we write it as

y \propto \frac{x}{z}

i . e ., y = k \frac{x}{z}

Where $k \neq 0$ is the constant of variation.

Topic Tags:#joint variation#direct and inverse variation