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# 2013-8thMathPTVocab4

### SHMS 8th Grade Math Powertime Vocab 4

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

Intersecting Lines | Two lines that cross each other. Lines intersect at one point unless the lines fall directly on top of each other (in which case they are essentially the same line and are sometimes called coincidental). |

Origin | The point of intersection of the vertical and horizontal axes of a Cartesian plane. The coordinates are (0, 0). |

Proportional Relationships | A relationship between two equal ratios. |

Slope | Steepness of a line. Can be found directly when a linear equation is in the form y = mx + b. It is the coefficient of x and represented by the letter m. Can also be found by determining the ratio of the rise to the run between two points on the graph. |

Unit Rate | A comparison of two measurements in which the second term has a value of 1. They are used to compare the costs of items in a grocery store. |

Clustering | The grouping of a data set into subsets (clusters), so that the data in each subset share some common trait. |

Outlier | An element of a data set that distinctly stands out from the rest of the data. |

Linear | A relationship or function that can be represented by a straight line. |

Non-linear | A relationship which does not create a straight line. |

Rate of Change | The ratio of the change in the output value and change in the input value of a function. |

Bivariate Data | Two different response variables that are from the same population. |

System of Linear Equations | Two or more equations that together define a relationship between variables. |

Simultaneous Equations | Another name for a system of Linear Equations. |

Created by:
hbogue