An **input-output table** is a two-column table in which the same rule is

applied to each input value resulting in the corresponding output values.

Find a rule that relates the numbers in the first column to the numbers in the second column.

x | rule |
y |

2 | × 20 | 40 |

5 | × 20 | 100 |

8 | × 20 | 160 |

11 | × 20 | 220 |

The *y*-values are 20 times the corresponding *x*-values.

Find a rule that relates the numbers in the first column to the numbers in the second column.

Lemonade

Amount of Water [fluid ounces] | rule |
Amount of Mix [tablespoons] |

12 | ÷ 3 | 4 |

24 | ÷ 3 | 8 |

36 | ÷ 3 | 12 |

48 | ÷ 3 | 16 |

The number of tablespoons of lemonade mix is the number of ounces of water divided by 3.