## Algebra | ## more ... |

Algebra uses letters (like x or y) or other symbols in place of unknown values. For example: x + 3 = 7"x" is unknown (often called the "variable"). In this case the value of "x" can be found by subtracting 3 from both sides of the equal sign like this: Start with: x + 3 = 7 Subtract 3 from both sides: x + 3 - 3 = 7 - 3 Calculate: x + 0 = 4 Answer: x = 4 |