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# Grade 8 Chapter 5

### Linear Equations

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

constant of variation | the constant k (in y = kx) |

direct variation | a linear relationship between two variables |

family of functions | a set of functions whose graphs have basic characteristics in common |

linear equation | any equation that can be written in standard form Ax + By = C |

linear function | a function whose graph forms a straight line |

parallel lines | lines in the same plane that do not intersect |

parent function | the simplest function with the defining characteristics of the family |

perpendicular lines | lines in the same plane that intersect at 90 degree angle |

rate of change | a ratio-compares the amount of change in a dependent variable to independent variable |

reflection | a transformation that reflects or “flips” a graph or figure across a line of reflection |

rise | the difference in the y-values of two points on a line |

rotation | a transformation that rotates or turns a figure about a point called the center of reflection |

run | the difference in the x-values of two points on a line |

slope | a measure of the steepness of a line-rise over run |

transformation | a change in the position |

translation | a transformation that slides every point of a figure or graph the same distance and direction |

x-intercept | the x-coordinate of the point where a graph intersects the x-axis |

y-intercept | the y-coordinate of the point where a graph intersects the y-axis |

absolute value function | a functions whose graph forms a v shape |x| |

quadratic functions | a functions whose graph forms a parabola x2 |