| Term | Definition |
| coefficient | a number that multiplies a variable. |
| constant | a term that has no variable. |
| equation | a mathematical sentence with an equal sign. |
| inequality | A mathematical sentence that contains less than, greater than, less than or equal to, greater than or equal to, or not equal |
| inverse operations | operations that undo each other. Addition and subtraction are this. Multiplication and division are this. |
| like terms | have identical variables. |
| solution of an equation | a value for a variable that makes an equation true. |
| solution of an inequality | any number that makes an inequality true. |
| term | a number or the product of a number and variable(s). |
| open sentence | an equation with one or more variables. |