Question

{2x+3y=9{8x-y=23 x=? y=? Помогите срочноооо

Answer 1

$\begin{cases}2x + 3y = 9 \\ 8x - y = 23 \mid \times \: 3 \end{cases} \\ \begin{cases}2x + 3y = 9 \\ 24x - 3y = 69 \end{cases} \\ \overline{ \qquad \qquad \qquad} \\ 26x = 78 \\ x = 3 \\ \overline{ \qquad \qquad \qquad} \\ 8 \times 3 - y = 23 \\ 24 - y = 23 \\ y = 1$

Ответ: x=3; y=1

Answer 2

Ответ:

$\displaystyle \left \{ {{x=3} \atop {y=1}} \right.$

Объяснение:

$\displaystyle \left \{ {{2x+3y=9} \atop {8x-y=23}} \right.$

$\displaystyle \left \{ {{2x+3*(8x-23)=9} \atop {y=8x-23}} \right.$

$\displaystyle \left \{ {{2x+24x-69=9} \atop {y=8x-23}} \right.$

$\displaystyle \left \{ {{26x=78} \atop {y=8x-23}} \right.$

$\displaystyle \left \{ {{x=3} \atop {y=8*3-23}} \right.$

$\displaystyle \left \{ {{x=3} \atop {y=1}} \right.$