I suspect you are looking for "formula".
Formula
An equation.
Function
Equations .
its called a quadrants
Formula
Is called an equation. ie A = Z
It is often called a formula.
A proportional relationship between two quantities is one in which the two quantities called the unit rate, the rate of change, or the constant of proportionality.
An equation.
The two quantities are porportional.
Function
it is called an inequality
an algebraic equation that describes a relationship between several variables is called a?
The relationship is called a surjection or a surjective function.
model
Equations .