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# Algebra 1 Chapter 4

### McDougal Littell

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

Coordinate Plane | A plane formed by two real number lines that intersect at a right angle. |

Ordered Pair | A pair of numbers used to identify a point in a plane. |

X-coordinate | The first number in a ordered pair. |

Y-coordinate | The second number in a ordered pair. |

X-axis | The horizontal axis in a coordinate plane. |

Y-axis | The vertical axis in a coordinate plane. |

Origin | The point (0,0) in a coordinate plane at which horizontal axis intersects the vertical axis. |

Quadrants | One of four parts into which the axes divide a coordinate plane. |

Graph of an ordered pair | The point in the plane that corresponds to an ordered pair (x,y) |

Scatter plot | A graph of pairs of numbers that represent real-life situations. It is a way to analyze the relationship between two quantities. |

Solution of an equation | A number that, when substituted for the variable in an equation, results in a true statement. |

Graph of an equation | The set of all points (x,y) that are solutions of the equation. |

X-intercept | The x-coordinate of a point where a graph crrosses the x-axis. |

Y-intercept | The y-coordinate of a point where a graph crosses the y-axis. |

Slope | The number of units a nonvertical line rises or falls for each unit of horizontal change from left to right. |

Rate of change | A comparison of two different quantities that are changing. |

Constant variation | The constant in variation model. |

Direct variation | The relationship of two variables x and y if there is a nonzero number. |

Slope-intercept form | An expression that has no perfect square factor other than 1 in the radicand, no fractions in the radicand, and no radicals appearing in the denominator of a fraction. |

Parallel Lines | Two different lines in the same plane that do not intersect. |

Relation | Any set of ordered pairs (x,y) |

Function Notation | A way to name a function that is defined by an equation. |

Graph of a function | The set of all points (x,f,(x), where x is in the domain of the function. |

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