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Math Help - Calculus of several variables

  1. #1
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    Calculus of several variables

    having trouble with his, do I just work backwards?

    Let f(x,y) be a function whose graph is a plane. Given that f x (1,2)= -3

    and f y (1,2) = 2 and that f(0,0) = 4 find f(x,y)
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  2. #2
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    If "its graph is a plane" then f(x,y)= Ax+ By + C. Now what are f_x(x,y) and f_y(x,y)?
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  3. #3
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    f_x(x,y) = A and f_y(x,y) = B ??
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  4. #4
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    is it f(x,y) = -3x + y + 4 = 0?
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