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Y+1 = (-4/3)*(x-9) // - (-4/3)*(x-9)
Y-((-4/3)*(x-9))+1 = 0
(4/3)*(x-9)+Y+1 = 0
4/3*(x-9)+Y+1 = 0
4/3*(x-9)+Y+1 = 0
Y+4/3*x-12+1 = 0
Y+4/3*x-11 = 0
Y+4/3*x-11 = 0
Y+4/3*x-11 = 0 // - Y-11
4/3*x = -(Y-11) // : 4/3
x = (-(Y-11))/4/3
x = 3/4*(11-Y)
x = 3/4*(11-Y)
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