An equation that is true for every value of the variable is called what?

1. Linear equations in one variable come in three kinds. 2. An identity equation is true for all values of the variable, so its solution set is all real numbers. 3. A conditional equation is true for only some values, and an inconsistent one is true for none. _Source: OpenStax College Algebra (CC BY 4.0), section 2.2 Linear Equations in One Variable_