From Wikipedia, the free encyclopedia
- For a chemical type of equation, see chemical equation.
There are two kinds of mathematical equations:
- The kind of equation that is either true or false; these are also called identities
- The kind of equation that lets you calculate the value of one or several variables. The equation is only true if the variable(s) have that value.
The second kind is often used to solve problems in which you have to know the value of some variables. For example, if 2x = 8, x = 8 / 2 = 4.