\"\"

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If \"\" when \"\", find \"\" when \"\".

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Find the constant of variation of the equation :

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The statement \"\" varies directly as \"\", means that when \"\" increases,  \"\" increases by the same factor.

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Hence \"\" and \"\"always have the same ratio.

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The constant of variation of the equation and the slope of the line have the same value.

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\"\"                  (Direct variation formula) 

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Find \"\":

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\"\"                 (Substitute \"\" and \"\")

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\"\"                      (Simplify)

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Therefore, the direct variation of the equation is \"\".

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\"\"

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Find \"\" when \"\" :

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\"\"                   (Direct variation of the equation)

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\"\"        (Substitute \"\")

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\"\"                     (Multiply)

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Therefore, the value of \"\" is \"\".

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\"\"

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The direct variation of the equation is \"\".

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The value of \"\" is \"\".