NEED Math Help ASAP PLZ!!!

I don't know how i got this question wrong.

In a direct variation, the constant of proportionality is -3.
Which of the following would be its equation?
A) y = x - 3
B) -3y = x
C) y = -3x
D) -3 = xy

I put A as my answer... but it says the answer is C! How is C the answer?
PLZ keep ur explanation simple.
Thanks for helping me,

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  1. direct variation means y is proportional to x
    (if you double x, you double y)

    algebraically that means;

    y = k * x where k is a constant which they call "constant of proportionality" and I just call "k" :)

    y = (-3) * x or -3x

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    posted by Damon
  2. thnx Damon 😊

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  3. You are welcome.

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    posted by Damon

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