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Y-4 = (-1/2)*(x-9) // - (-1/2)*(x-9)
Y-((-1/2)*(x-9))-4 = 0
(1/2)*(x-9)+Y-4 = 0
1/2*(x-9)+Y-4 = 0
1/2*(x-9)+Y-4 = 0
Y+1/2*x-9/2-4 = 0
Y+1/2*x-17/2 = 0
Y+1/2*x-17/2 = 0
Y+1/2*x-17/2 = 0 // - Y-17/2
1/2*x = -(Y-17/2) // : 1/2
x = (-(Y-17/2))/1/2
x = 2*(17/2-Y)
x = 2*(17/2-Y)
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