19. A solution of the differential equation $( d x / d y ) 2 - x ( d x / d y ) + y = 0$ is :
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(A) $y = 2$
(B) $y = 2 x$
(B) $y = 2 x - 4$
(D) $y = 2 \times 2 - 4$
19. A solution of the differential equation $( d x / d y ) 2 - x ( d x / d y ) + y = 0$ is :

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(A) $y = 2$\\
(B) $y = 2 x$\\
(B) $y = 2 x - 4$\\
(D) $y = 2 \times 2 - 4$\\