1.

Solve : x dy + y dx = 0

Answer»

∵ x dy + y dx = 0

x dy = - y dx

dy/y = - dx/x

Integrating both sides

∫dy/y = - ∫dx/x

log y = - log x + log c

log x + log y = log c

log x . y = log c

x . y = c



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