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x in (-oo:+oo)
y-9 = (-1/3)*(x-4) // - (-1/3)*(x-4)
y-((-1/3)*(x-4))-9 = 0
(1/3)*(x-4)+y-9 = 0
1/3*(x-4)+y-9 = 0
1/3*(x-4)+y-9 = 0
1/3*x+y-9-4/3 = 0
1/3*x+y-31/3 = 0
1/3*x+y-31/3 = 0
1/3*x+y-31/3 = 0 // - y-31/3
1/3*x = -(y-31/3) // : 1/3
x = (-(y-31/3))/1/3
x = 3*(31/3-y)
x = 3*(31/3-y)
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