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x in (-oo:+oo)
y-8 = (-1/6)*(x-1) // - (-1/6)*(x-1)
y-((-1/6)*(x-1))-8 = 0
(1/6)*(x-1)+y-8 = 0
1/6*(x-1)+y-8 = 0
1/6*(x-1)+y-8 = 0
1/6*x+y-8-1/6 = 0
1/6*x+y-49/6 = 0
1/6*x+y-49/6 = 0
1/6*x+y-49/6 = 0 // - y-49/6
1/6*x = -(y-49/6) // : 1/6
x = (-(y-49/6))/1/6
x = 6*(49/6-y)
x = 6*(49/6-y)
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