The number of integral values of \( m \), for which the \( x \)-coordinate of the point of inter...

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The number of integral values of \( m \), for which the \( x \)-coordinate of the point of intersection of the lines \( 3 x+4 y=9 \) and \( y=m x+1 \) is also an integer, is
(A) 2
(B) 4
(C) 1
(D) undefined
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