Answer :

(i) If the slope of the line is zero it means

M = tan θ


M = tan 0


Since, m = 0


So, The line is parallel to x - axis .


(ii) If the slope of the line is positive it means


Since θ is an acute


So, The line makes an acute angle with the positive x - axis .


(iii) If the slope of the line is positive it means


Since, θ is an obtuse


So, The line makes an obtuse angle with positive x - axis .


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