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  1. Direct, Inverse, Joint and Combined Variation

    • Direct or Proportional Variation When two variables are related directly, the ratio of their values is always the same. ...
    • Inverse or Indirect Variation Inverse or Indirect Variation refers to relationships of two variables that go in the opposite direction (their product is a constant, $ k$). ...
    • Joint Variation and Combined Variation ...
    mathhints.com/beginning-algebra/direct-inverse-and-joint-variation/
    mathhints.com/beginning-algebra/direct-inverse-and-joint-variation/
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    Variation problems involve fairly simple relationships or formulas, involving one variable being equal to one term. That term might be linear (something with just an " x "), quadratic (something in " x 2 "), more than one variable (such as " r 2 …

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