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# Chapter 2

### Linear Functions

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

Sequence | a pattern involving an ordered arrangement of numbers, geometrical figures, letters, or other objects |

Term | an individual number, figure, or letter in a sequence |

Ellipsis | a shortcut used to list a sequence |

Discrete Graph | a graph of isolated points |

Continuous Graph | a graph with no breaks in it |

Linear Graph | a graph that is a line or a series of collinear points |

Collinear Points | points that lie in the same straight line |

Non-Linear Graph | a graph that is not a line |

Mapping | represents two sets of objects or items |

Set | a collection of numbers, geometric figures, letters, or other objects that have some characteristic in common |

Function | maps each input to one and only one output |

Input | the first coordinate of an ordered pair in a relation |

Output | the second coordinate of an ordered pair in a relation |

Domain | the set of all the inputs of a function |

Range | the set of all the outputs of a function |

Scatter Plot | a graph of a collection of ordered pairs that allows an exploration of the relationship between the points |

Vertical Line Test | a visual method used to determine whether a relation represented as a graph is a function |

Absolute Value Function | a function that can be written in the form f(x) = |x| |

Square or Quadratic Function | a function that can be written in the form f(x) = ax^2 + bx + c, where a, b, and c are any numbers and a does not equal zero |

Cube or Cubic Function | a function that can be written in the form f(x) = ax^3 +bx^2 + cx + d |