Question 1072809
Don't know why.
Call the two numbers x and y.
1.{{{x-y=4}}}
and
{{{1/x-1/y=1/8}}}
Multiply both sides by {{{8xy}}}
{{{8y-8x=xy}}}
2.{{{8(y-x)=xy}}}

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*[illustration fr11.JPG].
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There is no real solution.
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Check your problem setup.
There is a solution if one of the differences is negative ({{{-4}}} or {{{-1/8}}}) but not as it's currently configured.