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Math Help - Solve using a change of coordinates?

  1. #1
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    Solve using a change of coordinates?

    How would one solve this using a change of coordinates using a transformation of the form a = a(x,y), b = b(x,y)?

    4dz/dx - 5dz/dy = x^2
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  2. #2
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    Try r = x,  s = 5x + 4y.
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