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# Math Gr 8 Chpt 1 Voc

### Chpt 1 Vocabulary

Question | Answer |
---|---|

Equation | An expression showing the equality of 2 quantities such as 2 +3 = 5 or 4x + 2 = 14 |

Inverse operation | Inverse operations are opposite operations. Addition is the opposite of subtraction; division is the opposite of multiplication, and so on. |

Distributive property | Multiplying each term inside the parentheses with the term outside of the parentheses. |

variable | A symbol for a number we don't know yet. It is usually a letter like x or y. Example: in x + 2 = 6, x is the variable. |

addition property of equality | States that if the same amount is added to both sides of an equation, then the equality is still true. |

Subtraction property of equality | States that when both sides of an equation have the same number subtracted from them, the remaining expressions are still equal. For example: If 5 = 5, then 5 - 2 = 5 - 2. |

Multiplication property of equality | States that when both sides of an equation are multiplied by the same number, the remaining expressions are still equal. For example: If 5 = 5, then 5 x 2 = 5 x 2. |

Division property of equality | States that if you divide both sides of an equation by the same nonzero number, the sides remain equal. |

like terms | Terms that have the exact same variables and exponents, but they can have different coefficients. 6x, 52x, -3x---Not 7y |

volume | Volume is the measure of the amount of space inside of a solid figure, like a cube, ball, cylinder or pyramid. V= l x w x h |

perimeter | the total distance around the edge of the figure. |

literal equation | An equation that has 2 or more variables and |

expression | A mathematical phrase that can contain ordinary numbers, variables (like x or y) and operators such as add,subtract,multiply, and divide. It does not have an equal sign |

solve | find the value of a numerical or algebraic expression. |

evaluate | find the value of a numerical or algebraic expression. |

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