Question

помогите срочно!!!!!!!!​

Answer 1

$a)\ \ \left\{\begin{array}{l}x-2y=8\\2x+y=1\end{array}\right\ \ \left\{\begin{array}{l}x=2y+8\\2(2y+8)+y=1\end{array}\right\ \ \left\{\begin{array}{l}x=2y+8\\4y+16+y=1\end{array}\right\\\\\\ \left\{\begin{array}{l}x=2y+8\\5y=-15\end{array}\right\ \ \left\{\begin{array}{l}x=2\\y=-3\end{array}\right\ \ \ \ Otvet:\ \ (\ 2\ ;-3\ )\ .$

$b)\ \ \left\{\begin{array}{l}4x+9y=1\ |\cdot 2\\5x-18y=-28\end{array}\right\ \oplus \ \left\{\begin{array}{l}4x+9y=1\\13x=-26\end{array}\right\ \ \left\{\begin{array}{l}9y=1-4x\\x=-2\end{array}\right\\\\\\\left\{\begin{array}{l}9y=9\\x=-2\end{array}\right\ \ \left\{\begin{array}{l}y=1\\x=-2\end{array}\right\ \ \ \ \ \ Otvet:\ (-2\ ;\ 1\ )\ .$