Question 469796
Start with the given {{{1/a + 1/b}}}
Combine this into 1 fraction, find common denominator
common denominator is ab
--> {{{1/a + 1/b = (b/ab)+(a/ab) = (a+b)/ab}}}
Then use substitution:
we know a+b = y and ab = x
--> {{{(a+b)/ab = y/x}}}