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a=tg135 = tg (180-45) = -tg45 = -1
-5 = -1*4 + b
b=-1
y= -x -1
b)
a = tg 120 = tg (180-60) = -tg 60 = -√3
-4 = -√3*2 + b
b= -4+2√3
y = -√3x - 4 + 2√3