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If the equation of the locus of a point equidistant from the points `(a_1, b_1)` and `(a_2, b_2)` is `(a_1-a_2)x+(b_1-b_2)y+c=0` , then the value of `c` is

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If the equation of the locus of a point equidistant from the points (a_1,b_1) and (a_2,b_2) is (a_1-a_2)x+(b_2+b_2)y+c=0 , then the value of C is

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Consider 3 points A(-1,1) , B(3,4) and C(2,0) . The line y=mx+c cuts line AC and BC at points P and Q res. If the area of DeltaABC=A_1 and area of DeltaPQC=A_2 and A_1=3A_2 then positive value of m is

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