Question 693273
{{{sqrt(y) - sqrt(y-5) = 1}}}
{{{sqrt(y) = sqrt(y-5) + 1}}} square both sides
{{{y = (y-5) + 2*sqrt(y-5) + 1}}} simplify
{{{0 = 2* sqrt(y-5) - 4 }}}
{{{4 = 2* sqrt(y-5)}}}
{{{2 = sqrt(y-5)}}} square both sides again
{{{4 = y - 5}}}
{{{y = 9}}}