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Y-4 = (-1/4)*(x-3) // - (-1/4)*(x-3)
Y-((-1/4)*(x-3))-4 = 0
(1/4)*(x-3)+Y-4 = 0
1/4*(x-3)+Y-4 = 0
1/4*(x-3)+Y-4 = 0
Y+1/4*x-4-3/4 = 0
Y+1/4*x-19/4 = 0
Y+1/4*x-19/4 = 0
Y+1/4*x-19/4 = 0 // - Y-19/4
1/4*x = -(Y-19/4) // : 1/4
x = (-(Y-19/4))/1/4
x = 4*(19/4-Y)
x = 4*(19/4-Y)
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