Can you write a linear inequality whose solution contains only positive x-values and positive y-values?

What are the two methods of adding together 8.5 and 9.5 entirely in Roman numerals?

In Roman numerals 8.5 = VIIIS or SIX and 9.5 = VIIIIS or SXSo: VIIIS+VIIIIS = XVIII => 8.5+9.5 = 18 or octodecim in LatinAnd: SIX+SX = IIXX => (10-1.5)+(10-0.5) = (20-2) or duodevginti in LatinNote: 2*S = I, 5*I = V and 2*V = XValues: X = 10, V = 5, I = 1 and S = 1/2 or 0.5QED by David Gambell