Posted by **David Lee** on Thursday, December 7, 2006 at 1:55am.

hey if dy/dx= -2 why is it wrong to say that y is alwats decreasing at a rate of -2? I don't really get it.

It is better to say that y is always decreasing with a slope of -2 on a graph of y(x), or at a rate of -2 per change in x. Saying that a rate is a number does not say enough about what variables are involved.

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