Question

Завершите решение.
$left { {{4x+5y=23} atop {x+2y=8}} right. = textgreater left { {{y=}frac{23-4x}{5} atop {x+2y=8}} right.$

Answer 1

$left { {{4x+5y=23} atop {x+2y=8}} right. =>  left { {{4x+5y=23} atop {4x+8y=32}} right. \(4x+5y)-(4x+8y)=23-32\-3y=-9 => y=3\x+2y=8 => x+6=8 => x=2$

$left { {{4x+5y=23} atop {x+2y=8}} right. =>left { {{y=}frac{23-4x}{5}  atop {x+2y=8}} right. \x+2*(frac{23-4x}{5} )=8\5x+46-8x=40\-3x=-6\x=2\2+2y=8\2y=6\y=3$

Ответ: (2;3)

Answer 2

$4x + 5y = 23 \ x + 2y = 8 \ \ y = frac{23 - 4x}{5} \ x + 2y = 8 \ \ x + frac{2(23 - 4x)}{5} = 8 : ( times 5) \ 5x + 2(23 - 4x) = 40 \5x + 46 - 8x = 40 \ - 3x = - 6 \ x = 2 \ \ 2 + 2y = 8 \ 2y = 6 \ y = 3$
Ответ: (2;3)

Answer 3

Спасибо большое!!! :)

Answer 4

Да не за что)