2. Find a function f(x, y) which is NOT linear in either a or y and for which the tangent plane at (1, 2, 3) is given by z =2 + 3x - y.

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A:

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A: Solve  5x =-5 3

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A: 4) Given:

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A:

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A: Ratio of heights=Ratio of shadows

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A:

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