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y+4 = (-2/3)*(x-9) // - (-2/3)*(x-9)
y-((-2/3)*(x-9))+4 = 0
(2/3)*(x-9)+y+4 = 0
2/3*(x-9)+y+4 = 0
2/3*(x-9)+y+4 = 0
2/3*x+y-6+4 = 0
2/3*x+y-2 = 0
2/3*x+y-2 = 0
2/3*x+y-2 = 0 // - y-2
2/3*x = -(y-2) // : 2/3
x = (-(y-2))/2/3
x = 3/2*(2-y)
x = 3/2*(2-y)
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