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# Special Functions

### Functions, Linear Functions, Proportional Functions, Direct Variation

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

Rate of Change | change in y divided by change in x |

Slope | rise over run for the graph, coefficient of x in the equation |

y-intercept | starting point on the graph, the place the line crosses the y-axis, the constant of the equation |

slope intercept form | the equation of a line, y = mx + b |

function | a relation where each x value has exactly one y value x canNOT repeat the graph must pass the vertical line test |

linear graph | a straight line |

linear table | constant rate of change (delta y divided by delta x is the same for each row of the table) |

linear equation | the variable can only be raised to the first power the variable canNOT be in the denominator no radical signs around the variable |

proportional graph | straight line that goes through the origin |

proportional table | y divided by x must be the same for each row of the table |

proportional equation | has a constant of 0 (equation will not show the constant) |

direct variation | a special type of linear relationship that can be written in the form of y =kx (graph must be a straight line going through the origin, equation has a constant of 0, y divided by x is constant for each row in the table) |

constant of proportionality | y divided by x in a proportional relationship |

constant of variation | the "k" in a direct variation y divided by x |

Created by:
hmyers