Предмет: Алгебра, автор: Z1mber

Решите систему уравнений:
{x+3y=1,
{5x-y=-11.

Ответы

Автор ответа: hELFire
1

Ответ:

(-2;1)

Объяснение:

\begin{cases}x+3y=1\\5x-y=-11\end{cases}\\\begin{cases}x=1-3y\\5(1-3y)-y=-11\end{cases}\\\begin{cases}x=1-3y\\5-16y=-11\end{cases}\\\begin{cases}x=-2\\y=1\end{cases}

Автор ответа: ПОЧЕМУЧКА3214
0

Ответ:

( -2; 1 )

Объяснение:

{x+3y=1,

{5x-y=-11.

{x= 1 - 3y

{5(1-3y)-y=-11.

5(1-3y)-y=-11

5-15y - y = -11

-16y = -16

y = 1

Если y=1, то x = 1 - 3*1 = 1 - 3 = -2

Ответ:( -2; 1 )

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