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