8
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x+xy=8 xy=-x+8 y=-1+8/x
18
x and y are being combined using a binary operation called "plus" and the result is xy.
Inverse proportion implies xy = c where c is the constant of [inverse] proportionality. x = 2 and y = 36 implies xy = 72 = c So the relationship is xy = 72 Then, if x = 4, y = 72/x = 72/4 = 18
x = 6y over (y-6)