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# Math 7 Unit 2 Vocab

### Unit 2: Expressions and Equations

Term | Definition |
---|---|

expression | A mathematical phrase that contains operations, numbers, and/or variables. |

equation | A mathematical sentence that contains an equals sign. |

term | a single mathematical expression. It may be a single number (positive or negative), a single variable (a letter), several variables multiplied but never added or subtracted |

Coefficient | number in front of a variable |

like terms | Terms that contain the same variables raised to the same power. |

simplify | to write an expression or fraction in a simpler form |

Distributive Property | a property indicating a special way in which multiplication is applied to addition of two or more numbers in which each term inside a set of parentheses can be multiplied by a factor outside the parentheses, such as a(b + c) = ab + ac |

Factoring | rewriting an expression as the product of its factors. undoing distribution |

isolate | to separate from others |

Variable | A symbol used to represent a quantity that can change |

inverse | opposite |

operation | addition, subtraction, multiplication, division |

Solution | an answer to a problem. a single number (NOT an expression) |

evaluate | To replace variables with numbers and then simplify an expression. a single number answer (NOT an expression). |

algebra | A branch of mathematics that involves expressions with variables and symbols. |

two-step equation | An equation that contains two operations. Example: 2n + 8 = 12 |

constant | A term without a variable. A quantity that does not change, it is usually a number. |

algebraic expression | Mathematical combination of variables, numbers and at least one operation. Example: 5n + 7 |