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20 January, 19:01

The variables x and y vary directly. if one pair of the values is x = 3 and y = 12, write an equation that shows the relationship between x and y.

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  1. 20 January, 19:16
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    The variables x and y vary directly. if one pair of the values is x = 3 and y = 12, write an equation that shows the relationship between x and y.
  2. 20 January, 19:25
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    If they vary directly then they increase at the same amount

    This can be written out with the equation

    y/x=k k being the constant of the variation

    In this case 12/3=4 the constant is 4

    So you can say y=4x
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