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Correct option is D
Equation of line passing through the point x1,y1 and having slope m is y−y1=mx−x1 Here m=tanθ, where θ is angle made by the line with x - axis in the positive direction. Since the line making an angle 45∘ with negative direction of x - axis, the angle made by the line with positive direction of x− axis is 180∘−45∘=135∘ Hence the slope of the line is m=tan135∘=−1 The equation of the line passing through the point (5,4) and having slope −1 is y−4=−(x−5)y−4=−x+5x+y−9=0 Therefore, the equation of the line is x+y−9=0Talk to our academic expert!
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