Ответ: (1; -2).
Объяснение:
2x-3y = 8;
x-y=3; => x=3+y;
2(3+y)-3y=8;
6+2y-3y=8;
-y=2;
y=-2. Подставляем в x=3+y:
x=3+(-2);
x=1.
Ответ:
[tex](1;-2)[/tex]
[tex]\begin{cases}2x-3y=8\; \\ x-y=3\ | \cdot\left( -3\right)}\end{cases}[/tex]
[tex]\begin{cases}2x-3y=8 \\ -3x+3y=-9\end{cases}[/tex]
+_____________
[tex]-x=-1\ |:\left( -1 \right) \\\\x=1[/tex]
[tex]x - y = 3\\\\1 -y = 3\\\\ -y = 3- 1\\\\ - y = 2\ \ \ |:\left( -1 \right)\\\\y=- 2[/tex]
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Ответ: (1; -2).
Объяснение:
2x-3y = 8;
x-y=3; => x=3+y;
2(3+y)-3y=8;
6+2y-3y=8;
-y=2;
y=-2. Подставляем в x=3+y:
x=3+(-2);
x=1.
Ответ:
[tex](1;-2)[/tex]
Объяснение:
[tex]\begin{cases}2x-3y=8\; \\ x-y=3\ | \cdot\left( -3\right)}\end{cases}[/tex]
[tex]\begin{cases}2x-3y=8 \\ -3x+3y=-9\end{cases}[/tex]
+_____________
[tex]-x=-1\ |:\left( -1 \right) \\\\x=1[/tex]
[tex]x - y = 3\\\\1 -y = 3\\\\ -y = 3- 1\\\\ - y = 2\ \ \ |:\left( -1 \right)\\\\y=- 2[/tex]
[tex](1;-2)[/tex]