Unrelated, directly, inversely, reciprocal

2 items that are associated such that when one item increases, the other increases. (The graph of two directly related items extends from lower left to upper right.)

Directly related/ directly proportional

Two items are associated such that when when one item increases the other decreases, (The graph of two inversely related items extends from upper left to the right)

Inversely related/inversely proportional ( grades in school are inversely related to partying time)

When two numbers with the reciprocal relationship or multiplied together, the result is one. This is a special form of inverse relationship. Reciprocal numbers are inverse because when one increases, the other decreases.

Reciprocal relationship (2 and 1/2 are reciprocals) (Period and frequency are reciprocals)

2 items that are associated or affiliated. However, the relationship between the items does not have to be specified.

Related/ proportional ( weight is related to dieting)

2 items that are not associated

Unrelated