Автор - Delarnish

Розвязать систему уравнений.
2xy + x =  - 9 \ 2xy + y =  - 14

Ответ

Автор - papagenius

Пошаговое объяснение:

[begin{gathered}left{begin{gathered}2xy+x=-9hfill\2xy+y=-14hfill\end{gathered}right.Leftrightarrowleft{begin{gathered}2xy=-9-xhfill\2xy=-14-yhfill\end{gathered}right. hfill \-9-x=-14-y hfill \-x=-14-y+9 hfill \-x=-5-y;;;;;;|*(-1) hfill \x=5+yhfill \2xy=-14-yhfill \2(5+y)y=-14-yhfill \end{gathered}]

[begin{gathered}10y+2{y^2} =-14-yhfill \2{y^2}+10y+y+14=0 hfill \2{y^2}+11y+14=0hfill \D={b^2}-4achfill \D={11^2}-4*2*14=121- 112=9 hfill \ end{gathered} ]

[begin{gathered}{y_{1,2}}=frac{{-bpmsqrt D}}{{2a}}=frac{{-11 pm sqrt 9}}{{2*2}}=frac{{-11pm 3}}{4}hfill \{y_1}=frac{{-11+3}}{4}=frac{{-8}}{4}=-2 hfill \{y_2}=frac{{-11-3}}{4}=frac{{-14}}{4}=-frac{7}{2}=-3.5 hfill \ end{gathered} ]

[begin{gathered}{x_1} = 5 + {y_1} = 5 + (-2)=5-2=3 hfill \{x_2} = 5 + {y_2} =5+ (-3.5)=5-3.5=1.5 hfill \boxed{{x_1} = 3,{y_1} =-2} hfill \boxed{{x_2} = 1.5,{y_2}=-3.5}hfill \ end{gathered}]

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