solution set of the inequality y<0 is :
a) half of XOY plane which lies below x-axis
b) half of XOY-plane which lies above Xaxis
c) half of XOY - plane whichlies below x axis including the points on the x axis
d) none of theese.
correct answer is a)
but i am confused that why we can't take c) ??????????

Hi, We cannot take c because inequality is y<0 that restrict that we cannot take points on x -axis that are y = 0 because here we are clearly mentioned that y<0.The option c was correct when question was asked that set of inequality y0.Here y = 0 is included.

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