X=45
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The equation is xy = 5*9 = 45 Alternatively, y = 45/x
13
x/5 = 8/21 x = 8/21 * 5 x = 1.904761905
So 5 = (xy)^2 and x = 2.5. This means that 5 = (2.5y)^2. So sqrt(5)/2.5 = y when x = 2.5. Now if x = 9 then 5 = (9y)^2. So sqrt(5)/9 = y. This means that for any x in this relation y = sqrt(5)/x.
x/5 = 3 Multiply both sides by 5 to find the value of x:- x = 15