Mark the correct alternative in each of the following: The equations of the sides \( A B, B C \)...

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Mark the correct alternative in each of the following:
The equations of the sides \( A B, B C \) and \( C A \) of \( \triangle A B C \) are \( y-x=2, x+2 y=1 \) and \( 3 x+y+5=0 \) respectively. The equation of the altitude through \( B \) is
(A) \( x-3 y+1=0 \)
(B) \( x-3 y+4=0 \)
(C) \( 3 x-y+2=0 \)
(D) none of these
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