1.

The solution of the DE ` x dy + y dx = 0 ` isA. `x+y = C `B. `xy = C `C. ` log (x + y )= C `D. none of these

Answer» Correct Answer - B
` xdy = y dx = 0 rArr int (1)/(y) dx = - int (1)/(x) dx rArr log y = - log x + logC`.
` therefore log xy =log C rArr xy = C`.


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