Question

Решите все подробно даю 25 баллов

Answer 1

Ответ:

$1)\ \left\{\begin{array}{l}2x+3y=-1\ |\cdot 3\\3x+5y=-2\ |\cdot (-2)\end{array}\right\ \oplus \ \left\{\begin{array}{l}2x=-3y-1\\-y=1\end{array}\right\ \ \left\{\begin{array}{l}2x=2\\y=-1\end{array}\right\ \ \left\{\begin{array}{l}x=1\\y=-1\end{array}\right\\\\\\Otvet:\ (\ 1\ ;-1\ )\ .$

$2)\ \ \left\{\begin{array}{l}2n-3d=-1\ |\cdot 3\\3n+4d=24\ |\cdot (-2)\end{array}\right\ \oplus \ \left\{\begin{array}{l}2n=3d-1\\-17d=-51\end{array}\right\ \ \left\{\begin{array}{l}2n=8\\d=3\end{array}\right\ \ \left\{\begin{array}{l}n=4\\d=3\end{array}\right\\\\\\Otvet:\ \ (\ 4\ ;\ 3\ )\ .$

$3)\left\{\begin{array}{l}2a+3b=0\ |\cdot 2\\7a-2b=-25\ |\cdot 3\end{array}\right\ \oplus \ \left\{\begin{array}{l}3b=-2a\\25a=-75\end{array}\right\ \ \left\{\begin{array}{l}3b=6\\a=-3\end{array}\right\ \ \left\{\begin{array}{l}b=2\\a=-3\end{array}\right\\\\\\Otvet:\ (-3\ ;\ 2 \ )\ .$