Xy/y = x
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Paired numbers in the form (x,y) are commonly the x- and y-components of a point in a XY-coordinate system
Suppose the numbers are x and y. The sum of their reciprocals = 1/x + 1/y = y/xy + x/xy = (y+x)/xy = (x+y)/xy = 10/30 = 1/3
(x-y) + (xy - 1) = (x - 1)(y + 1)
xy + x + y + 1 = (x + 1)(y + 1).
6xy/16y = 3x/8 (as long as y≠0) = 3/8x