Question

Rational Expression and EquationsClassify each equation as direct inverse or joint variation then state the constant of variation

Answer 1

2. Given:

`y=7z`

To classify the equation as direct, inverse or joint variation then state the constant of variation​:

It is of the form,

`y=kz,\text{ whe}re\text{ }k\text{ is the constant}`

If y increases then z increases and if y decreases then z decreases.

Therefore, it is direct variation.

We know that the ratio between two variables in a direct variation is a constant of variation.

Thus, the constant of variation is k = 7.