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y-1 = (-5/9)*(x-18) // - (-5/9)*(x-18)
y-((-5/9)*(x-18))-1 = 0
(5/9)*(x-18)+y-1 = 0
5/9*(x-18)+y-1 = 0
5/9*(x-18)+y-1 = 0
5/9*x+y-10-1 = 0
5/9*x+y-11 = 0
5/9*x+y-11 = 0
5/9*x+y-11 = 0 // - y-11
5/9*x = -(y-11) // : 5/9
x = (-(y-11))/5/9
x = 9/5*(11-y)
x = 9/5*(11-y)
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