1. What is the equation of the line passing through the point (1,3) and making an angle of -45° with the positive x-axis?
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By: anil on 05 May 2019 02.14 am
Slope of line making an angle of -45° with the positive x-axis = $$tan(-45$$°$$)$$ => Slope, $$m = -tan(45)=-1$$ Line is passing through point (1,3) Equation of line having slope $$m$$ and passing through $$(x_1,y_1)$$ is : $$(y-y_1) = m(x-x_1)$$ => $$(y-3) = -1(x-1)$$ => $$y-3=-x+1$$ => $$x+y=4$$ => Ans - (A)
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