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Question

The equation of the line passing through (1, - 5) and making an angle 135 with the x-axis is

A
xy+4=0
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B
xy4=0
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C
x+y2=0
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D
x+y+4=0
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Solution

The correct option is D x+y+4=0
Equation of a line passing through (x1,y1) having slope m=tanθ is
yy1=m(xx1)
Equation of a line passing through (1,5) having slope m=tan135=tan(90+45)=cot45=1 is
y+5=1(x1)
y+5+x1=0 or x+y+4=0
x+y+4=0 required equation.

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