Answer:
1. Direct Variation – is a relationship between two variables x & y such that the
ratio (or quotient) of y to x is a constant.
In symbols, y varies directly as x is written as y/x=k or y= kx where k≠0 is called
the constant of variation.
2. Inverse Variation – is a relationship between two variables x & y such that n
matter how the values of k, x, and y change, their product is a constant.
In symbols, y varies inversely as x is written as =
or k= xy where k≠0 is called
the constant of variation.
3. Joint Variation – is a variation where variable varies as the product of two or
more other variables.
In joint variation, z varies jointly as x and y. In symbols, we write, z = kxy or
=
where k≠0 is called the constant of variation.
4. Combined Variation – is a variation that involves both direct and inverse
variations.
The statement z varies directly as x and inversely as y means z =
or =
where k≠0 is called the constant of variation.
