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# Functions

### Vocabulary for Algebra I - Functions

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

Continuous Graph p. 201 | graphs made with a connected line or curve |

Discrete Graph p. 201 | graphs made with individual, distinct points |

Relation p. 206 | a set of ordered pairs |

Domain p. 206 | in a relation, the set of first coordinates (or x-values) of the ordered pairs |

Range p. 206 | in a relation, the set of second coordinates (or y-values) of the ordered pairs |

Function p.207 | a special type of relation that pairs each domain value with exactly one range value (the x-values cannot repeat) |

Dependent Variable p. 216 | In a function, the variable (usually "y") that you get by doing the calculation in the equation - it "depends" on what you plug into the equation for "x" |

Independent Variable p. 216 | In a function, the variable (usually "x") that is plugged into an equation to yield results for the dependent variable. Usually, you can pick any number for this value to create ordered pairs. |

Function Notation p. 216 | In a function, if "x" is independent and "y" is dependent, the function notation for "y" is "f(x)" - read "f of x". When you see function notation, it signals that the equation and resulting relation is a function. |

Scatter Plot p. 224 | a graph with points plotted to show a possible relationship between two sets of data. |

Correlation p. 224 | describes a relationship between two data sets |

Positive Correlation p. 225 | both sets of data values increase - scatter implies an upward sloping trend line |

Negative Correlation p. 225 | one set of data values increases as the other set decreases - scatter implies a downward sloping trend line |

No Correlation p. 225 | there is no relationship between the data sets - the scatter looks random |

Trend Line p. 227 | a line added to a scatter plot to help show the correlation between data sets more clearly |

Sequence p. 234 | a list of numbers that often form a pattern |

Term p. 234 | each number in a sequence |

Arithmetic Sequence p. 234 | when the terms in a sequence differ by the same amount - that is they are all the same distance apart |

Common Difference p. 234 | the distance "d" apart the numbers are in an arithmetic sequence |