The idea is to replace "x" by its value, to replace "y" by its value, and then to do the calculations.
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x+xy=8 xy=-x+8 y=-1+8/x
That is irrelevant, there is not possible way y=xy, and there is no possible way xy=x.
So far you know that: x=-8 xy=1 so xy means x times y. If you split xy. y=1/x or y=1/-8 1/-8= -0.125 You can find out that this is correct with the formula xy=1 because -0.125 x -8 is 1.
It is then x/y when simplified