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Questions  

The locus represented by the equation (xy+c)2+(x+yc)2=0 is 

a
a line parallel to x-axis
b
a point
c
a pair of straight lines
d
a line parallel of y-axis

detailed solution

Correct option is B

From the given equation we havex−y+c=0 and  x+y−c=0 which representsthe point (0, c.)

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