Question

Помогите пожайлуста !!!!!​

Answer 1

Ответ:

$1)\ \ 5x+3y=4\\\\(2;-2):\ \ \ \ 5\cdot 2-3\cdot 2=10=6=4\ \ ,\ \ 4=4\\\\Otvet:\ B)\ .\\\\2)\ \ 2x-5y=10\\\\OX:\ \ y=0\ \ \to 2x-5\cdot 0=10\ \ ,\ \ 2x=10\ \ ,\ \ x=5\\\\Otvet:\ \ (5;0)\ .\\\\3)\ \ \left\{\begin{array}{l}5x-4y=11\\2x+4y=10\end{array}\right\ \oplus \ \left\{\begin{array}{l}7x=21\\4y=10-2x\end{array}\right\ \ \left\{\begin{array}{l}x=3\\4y=4\end{array}\right\ \ \left\{\begin{array}{l}x=3\\y=1\end{array}\right\\\\\\Otvet:\ \ A(3;1)\ .$

$4)\ \ \left\{\begin{array}{l}15x+2y=7\\2x-y=6\ |\cdot 2\end{array}\right\ \oplus \ \left\{\begin{array}{l}19x=19\\y=2x-6\end{array}\right\ \ \left\{\begin{array}{l}x=1\\y=-4\end{array}\right\\\\\\Otvet:\ (1;-4)\ .$