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x in (-oo:+oo)
y = (-9/2)*x+4 // - (-9/2)*x+4
y-((-9/2)*x)-4 = 0
(9/2)*x+y-4 = 0
9/2*x+y-4 = 0 // - y-4
9/2*x = -(y-4) // : 9/2
x = (-(y-4))/9/2
x = 2/9*(4-y)
x = 2/9*(4-y)
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