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Math Help - Help me please

  1. #1
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    Question Help me please

    I could not be more lost in trying to figure out this problem. How do I solve it?



    Determine whether 1 - y = 2x is a direct variation.
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  2. #2
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    Direct Variation

    When two variable quantities have a constant (unchanged) ratio, their relationship is called a direct variation.


    The general form of a direct variation is y = kx, where k is the constant of variation which describes the relationship between variables y and x.

    1 - y = 2x can be written as y = 2x + 1

    I beleive that the '+ 1' makes the equation not a direct variation.

    A test for checking the situation could be as follows:
    If you double x and y also doubles then it is a direct variation. In this case it is not.
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  3. #3
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    Thank you for your help
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