Yes.
variables
equivalent expression
An equation that is always true is an identity.
that is called the solution set
Constant variables are constant, they do not change. Derived variables are not constant. They are determined by the other values in the equation.
Yes.
They probably are called variables.
variables
Nominal Variables
Assumptions or variable.
They take the place of an unknown quantity. They can change values, thus they are called variables, their quantity varies.
Variables. If you're talking about math.....
equivalent expression
There are several possibilities. They can be called arguments and there are two kinds, variables and constants. Variables can have different values and constants are always the same.
An equation that is always true is an identity.
that is called the solution set