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Questions  

For the line x+y2=0 1,2,1,2 , the points  

a
Both lies on the same side of the line
b
Both lies opposite side of the line
c
Both lies on the line
d
not possible to decide

detailed solution

Correct option is B

Suppose that L=0 be a line. Suppose that A,B are any two points.  Substitute the points in the equation of the line L=0, the values obtained are LA,LB If the values LA,LB are of same sign, then the points A,B lies on the same side of the line L=0 If the values LA,LB are of opposite sign, then the points A,B lies on the opposite side of the line L=0

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