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