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x in (-oo:+oo)
Y-4 = (-2/4)*(x+4) // - (-2/4)*(x+4)
Y-((-2/4)*(x+4))-4 = 0
(1/2)*(x+4)+Y-4 = 0
1/2*(x+4)+Y-4 = 0
1/2*(x+4)+Y-4 = 0
Y+1/2*x-4+2 = 0
Y+1/2*x-2 = 0
Y+1/2*x-2 = 0
Y+1/2*x-2 = 0 // - Y-2
1/2*x = -(Y-2) // : 1/2
x = (-(Y-2))/1/2
x = 2*(2-Y)
x = 2*(2-Y)
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