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# Unit Four

### Graphs & Two-Variable Equations

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

coefficient | a number that is multiplied by a variable(s) |

constant | a fixed value that does not appear with a variable(s) |

constant of proportionality | a constant ratio between two proportional quantities denoted by the symbol k |

constant rate of change | a ratio when the dependent, y-value, changes at a constant rate for each independent, x-value |

Linear relationship | a relationship with a constant rate of change represented by a graph that forms a straight line |

Rational numbers | the set of numbers that can be expressed as a fraction , where a and b are integers and b ≠ 0. The set of rational numbers is denoted by the symbol Q. |

Rise | how many units you move up or down from point to point. |

Run | how far left or right you move from point to point. |

Slope intercept form | In the equation of a straight line (when the equation is written as "y = mx + b"), the slope is the number "m" that is multiplied on the x, and "b" is the y-intercept (that is, the point where the line crosses the vertical y-axis). |

origin | The starting point. On a two-dimensional graph it is where the X axis and Y axis cross. |