| Term | Definition |
| equation | xy+xy=2xy |
| coefficient | A number or quantity placed (generally) before and multiplying another quantity, as 3 in the expression 3x. |
| variable | A quantity or function that may assume any given value or set of values. |
| substitute | Step 1(eliminating variable by substitution) |
| clear fractions | Step 2(eliminating variable by substitution) |
| remove parentheses | Step 3(eliminating variable by substitution) |
| collect terms | Step 4(eliminating variable by substitution) |
| evaluate | Step 5(eliminating variable by substitution) |
| Voltage equals | P / I |
| Power equals | EI |