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x in (-oo:+oo)
y = (9/5)*x+4 // - (9/5)*x+4
y-((9/5)*x)-4 = 0
(-9/5)*x+y-4 = 0
y-9/5*x-4 = 0 // - y-4
-9/5*x = -(y-4) // : -9/5
x = (-(y-4))/(-9/5)
x = -5/9*(4-y)
x = -5/9*(4-y)
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