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# Module 4

### How to solve problems using direct, indirect, and joint variation

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

Is y = 2x direct, inverse, or joint variation? | Direct variation. y = kx |

Is y = 10xz direct, inverse, or joint variation? | Joint variation. y = kxz |

Is y = 3/x direct, inverse, or joint variation? | Inverse variation. y = k/x |

Find the constant of variation k if y varies directly with x and y = 12 when x = 156 | Constant of variation is 1/13 |

Find the direct variation equation if the constant of variation is 1/13 | y = 1/13x |

The amount of pollution varies directly with the population N of people. City A has a population of 620,000 and produces 360,000 tons of pollutants. How many tons of pollution should City B be expected to produce if it's population is 350,000? | 203,226 tons or pollutants |

Find the constant of variation if y varies inversely with x and y = 12 when x = 8 | k = 96 |

Find the inverse variation equation if the constant of variation is 96 | y = 96/x |

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