Question

ПОМОГИТЕ ПОЖАЛУЙСТА ОЧЕНЬ СРОЧНОООО
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Answer 1

Ответ:

$48)\ \left\{\begin{array}{l}\dfrac{2-x}{2}+\dfrac{y}{3}=2\\4(x+2y)-6y=4\end{array}\right\ \ \left\{\begin{array}{l}3(2-x)+2y=12\\4x+8y-6y=4\end{array}\right\ \ \left\{\begin{array}{l}6-3x+2y=12\\2y+4x=4\end{array}\right\\\\\\\left\{\begin{array}{l}2y-3x=6\\2y+4x=4\end{array}\right\ \ominus \ \left\{\begin{array}{l}-7x=2\\y=2-2x\end{array}\right\ \ \left\{\begin{array}{l}x=-\dfrac{2}{7}\\y=2+\dfrac{4}{7}\end{array}\right\ \ \left\{\begin{array}{l}x=-\dfrac{2}{7}\\y=2\dfrac{4}{7}\end{array}\right$

$Otvet:\ \ \Big(-\dfrac{2}{7}\ ;\ 2\dfrac{4}{7}\ \Big)\ .$

$49)\ \left\{\begin{array}{l}\dfrac{x+9}{2}-\dfrac{y+8}{3}=6\ |\cdot 6\\2(x-y)-3(x+y)=-4\end{array}\right\ \ \left\{\begin{array}{l}3(x+9)-2(y+8)=36\\2x-2y-3x-3y=-4\end{array}\right$

$\left\{\begin{array}{l}3x+27-2y-16=36\\-x-5y=-4\end{array}\right\ \ \left\{\begin{array}{l}3x-2y=25\\x+5y=4\ |\cdot (-3)\end{array}\right\ \oplus \ \left\{\begin{array}{l}-17y=13\\x=4-5y\end{array}\right$

$\left\{\begin{array}{l}y=-\dfrac{13}{17}\\x=4+\dfrac{65}{17}\end{array}\right\ \ \left\{\begin{array}{l}y=-\dfrac{13}{17}\\x=\dfrac{133}{17}\end{array}\right\ \ \left\{\begin{array}{l}\ \ y=-\dfrac{13}{17}\\x=7\dfrac{14}{17}\end{array}\right\ \ Otvet:\ \ \Big(\ 7\dfrac{14}{17}\ ;\,-\dfrac{13}{17}\ \Big)\ .$