[" (A) "x+y=1" (B) "x-y=1quad (C)x+y+1=0...

[" (A) "x+y=1" (B) "x-y=1quad (C)x+y+1=0quad " (D) none of these "],[" if the lines "3y+4x=1,y=x+5" and "5y+bx=3" are concurrent,then "b=],[[" (A) "1," (B) "3," (A "y in)" 6"," (D) none of these "],[" If "(0,0),(3,0)" and "(0,4)" are vertices of a friangle.then othocentre is "]]

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