The circum-centre of the triangle formed by the lines \( x+4 y=7,5 x+3 y=1 \) and \( 3 x-5 y=21 ...
The circum-centre of the triangle formed by the lines \( x+4 y=7,5 x+3 y=1 \) and \( 3 x-5 y=21 \) is
(a) \( (-3,2) \)
(b) \( (3,1) \)
(c) \( (3,-1) \)
(d) \( (-3,-2) \)
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