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24 April, 15:37

The variables x and y vary directly. Use the given values to write an equation that relates x and y: x = 4, y = - 16

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  1. 24 April, 18:49
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    Vary Directly: y = k*x

    Vary Inversely: y = k/x

    Because x and y vary directly, our equation will look like the first one.

    y = k*x

    With the inputted values:

    -16 = k * 4

    Now, to find k, isolate the variable

    k = - 16/4 = - 4

    Your final equation will then look like this:

    y = - 4 * x
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