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# Unit 5

### Proportional Relationships

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

coordinate plane | A plane containing a horizontal number line, x-axis, and a vertical number line, y-axis, that intersect at their zero points called the origin. |

x-axis | The horizontal axis in a coordinate plane. |

y-axis | The vertical axis in a coordinate plane. |

origin | The intersection of the x-axis and y-axis in a coordinate plane that has the coordinates (0,0). |

quadrant | One of the four regions into which the x-axis and y-axis divide the coordinate plane. |

ordered pair | A pair of numbers that can be used to locate a point on a coordinate plane. |

interpret | Explain the meaning of. |

relate | A component of a given set is associated with a component of another set. |

proportional | When two quantities always have the same relative size and therefore the same ratio. |

equivalent | Equal in value. |

unit rate | A ratio in which the second term's quantity is ONE unit. |

constant rate of proportionality | The constant value of the ratio of two proportional quantities. |

constant | Occurring continuously over a period of time. |

diagram | A drawing used to describe something. |

variable | A letter or symbol used to represent an unknown quantity. |

substitute | Placing a number in place of a variable. |

direct variation | Mathematical relationship between two variables that can be expressed by an equation in which one variable is equal to a constant times the other variable. |

predict | To estimate that a specific thing will happen in the future or will be a consequence of something. |

Created by:
Mrs Ott