relationship

A relationship is the way in which two things are connected. 

In Mathematics, we are mostly looking at how two variables are connected.

Example 1

The connection between sales of ice creams and the daily temperature.

Relationship: As the temperature increases, the sales of ice creams generally increase.

Example 2

A = {1, 2, 3, 4, 5}

B = {2, 4, 6, 8, 10}

Relationship: Set B is twice the size of Set A.

Example 3

The graph below has a linear relationship.

Example 4

The graph below has a parabolic relationship.