{х^2+у^2=25
Ху=12}
{Х=12/у
144/у^2+у^2=25}
{144=(25-у^2)у^2
{144=25у^2-у^4 t=y^2
{144=25t-t^2. y=+-3
{t^2-25t+144=0. y=-+4
D=625-576=49
T1=9
T2=16
Х=+-4
Х=+-3
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Answers & Comments
{х^2+у^2=25
Ху=12}
{Х=12/у
144/у^2+у^2=25}
{144=(25-у^2)у^2
{144=25у^2-у^4 t=y^2
{144=25t-t^2. y=+-3
{t^2-25t+144=0. y=-+4
D=625-576=49
T1=9
T2=16
Х=+-4
Х=+-3