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m2= -1/2
x1= 2
y1= -1
y-y1 =m2(x-x1)
y-(-1) = -1/2(x-2)
y+1 = -1/2x+1
______________×2
2y+2 = -x+2
x+2y = 2-2
x+2y = 0 (C)