Question

Срочно решите систему уровнений на лестке 10б​

Answer 1

$\begin{cases}5x+2y=8\\11x-y=23\end{cases}\Rightarrow\begin{cases}5x+2\cdot(11x-23)=8\\y=11x-23\end{cases}\\\\5x+2\cdot(11x-23)=8\\5x+22x-46=8\\27x=54\\x=2\\\begin{cases}x=2\\y=-1\end{cases}$

Answer 2

{5х+2у=8,

{11х-у=23(×2)

______

{5х+2у=8, {27х=54,

{22х-2у=46. {5х+2у=8

1)27х=54. 2)5х+2у=8

х=2. 5•2+2у=8

2у=8-10

у=-2:2

у=-1

ответ: (2;-1)