'xy11' is NOT an equation, because it is not equated to anything. It is an algebraic EXPRESSION.
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It is not a even a valid equation since "rate" is not a well-defined term. Rate is simply the average change in something per unit of time. If properly defined, it is an equivalence relationship.
It is one form of a unit rate.
Unit Rates ... Is the rate for one unit of a given quantity. Unit means one .
The rate for unit of a given quanitity called the unit rate.
There is no unit rate for 155