Question

Система 4x-28=8x-3(2y-2 ) и

Answer 1

ответ: x =  $\frac{-11}{2}$y = 2.

$\left \{ {{4x-28=8x-3(2y-2)} \atop {4x+6y-4x=2y+8}} \right.$

$\left \{ {{4x-28=8x-3(2y-2)} \atop {6y=2y+8}} \right.$

$\left \{ {{4x-28=8x-3(2y-2)} \atop {4y=8}} \right.$

$\left \{ {{4x-28=8x-3(2y-2)} \atop {y=2}} \right.$

Подставим y:

$\left \{ {{4x-28=8x(2*2-2)} \atop {y=2}} \right.$

$\left \{ {{4x-28=8x-6)} \atop {y=2}} \right.$

$\left \{ {{-4x=22)} \atop {y=2}} \right.$

$\left \{ {{x=\frac{-11}{2} )} \atop {y=2}} \right.$