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x in (-oo:+oo)
y = (4/9)*x+8 // - (4/9)*x+8
y-((4/9)*x)-8 = 0
(-4/9)*x+y-8 = 0
y-4/9*x-8 = 0 // - y-8
-4/9*x = -(y-8) // : -4/9
x = (-(y-8))/(-4/9)
x = -9/4*(8-y)
x = -9/4*(8-y)
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