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# unit 3 vocabulary

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

constants of proportionality | he constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality |

direct variation | two variables that can be expressed by an equation in which one variable is equal to a constant times the other |

linear equation | an equation of the first degree in any number of variables |

point-slope form | The equation of a straight line in the form y-y1= m (x-x1), where m is the slope of the line and (x1, y1) are the coordinates of a given point on the line in a Cartesian coordinate system. |

slope-intercept | the equation of a straight line in the form y = mx + b where m is the slope of the line and b is its y-intercept |

rate of change | a value that results from dividing the change in a function of a variable by the change in the variable <velocity is the rate of change in distance with respect to time> |

slope | the tangent of the angle between the line and another line parallel to the x-axis |

x-intercept | the x-coordinate of a point where a line, curve, or surface intersects the x-axis |

y-intercept | the y-coordinate of a point where a line, curve, or surface intersects the y-axis |

unit rate | a price or charge with reference to a standard or scale |

proportional relationship | Two quantities are proportional if they vary in such a way that one of them is a constant multiple of the other. |

intersecting lines | The notion of line or straight line was introduced by ancient mathematicians to represent straight objects with negligible width and depth. Lines are an idealization of such objects |

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62malpri