| A | B |
| identity | equation that is true for all values of the variable |
| equivalent equations | equations that have the same solution |
| formula | equation that relates two or more quantities |
| ratio | comparison of 2 numbers with the same units |
| percent | divided by 100 |
| reciprocal | two non-zero numbers whose product is -1 |
| rate | comparison of two numbers with differnt units |
| linear equation | equation in which the exponent on the variable is one |
| inverse operations | two operations that undo each other |