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Old 2015-03-20, 18:53   #2
Dubslow
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"Bunslow the Bold"
Jun 2011
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If you mean x and y are independent variables, and z is dependent on x and y (I.e. is a function of x and y), then I just said the answer.

Hint: What is a derivative?

a derivative measures how one quantity varies [u]as another does[/u].

so dy/dx is asking "if x varies some amount, how does y vary [u]accordingly[/u]?"

Last fiddled with by Dubslow on 2015-03-20 at 18:56
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