Equation of Straight Line/Repeatedly comming entrance exam questions/

[@Naod22]

if teta1 = 45deg then teta2 = 135deg since they are perpendicular.
m2 = tan^-1(135) = -1
the lines intersect at (-1,2) , line2 must give y-value of "2" for the x-value of "-1"
Answer: C

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C

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M=-1,x=-1,y=2,
Then substitute y=mx+b
2=-1.-1+b
b=1
Next we can write slope form
Y=-x+1
The answer is C

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B

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C

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A

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