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Y-9 = (-1/2)*(x-5) // - (-1/2)*(x-5)
Y-((-1/2)*(x-5))-9 = 0
(1/2)*(x-5)+Y-9 = 0
1/2*(x-5)+Y-9 = 0
1/2*(x-5)+Y-9 = 0
Y+1/2*x-9-5/2 = 0
Y+1/2*x-23/2 = 0
Y+1/2*x-23/2 = 0
Y+1/2*x-23/2 = 0 // - Y-23/2
1/2*x = -(Y-23/2) // : 1/2
x = (-(Y-23/2))/1/2
x = 2*(23/2-Y)
x = 2*(23/2-Y)
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