.Решите систему пожалуйста:
[tex] \left \{ {{x*y=9} \atop {x+y=6}} \right. [/tex]
[tex] \left \{ {{x*y=9} \atop {x+y=6}} \right. [/tex]
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x=6-y (подставим в первое уравнение)
(6-y)y=9
6y-y^2=9
y^2-6y+9=0
D=36-36=0
y=6/2=3
x=3