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-x-y = -6
x+y=6
m= -a/b
= -1/1
= -1
y-y1= m ( x-x1)
y- (-1) = -1 ( x-(-2))
y+1 = -1 (x+2)
y+1 = -x-2
y= -x-2-1
y= -x-3
y = x - 6 => m = 1
y+1 = 1(x+2
y+1 = x+2
-1 = x -y