Question

решите системы
1)х+2y=11
y+2x=-5
2)у+4х=2
8х+3у=5

Answer 1

1)
$left { {{x+2y=11} atop {y+x = -5}} right.$
$left { {{x+2y=11} atop {y= -5 - 2x}} right. left { {{x+2(-5-2x)-11=0} atop {y = -5-2x}} right. left { {{x -10-4x-11=0} atop {y= -5 - 2x}} right. left { {{-3x-21=0} atop {y= -5 - 2x}} right. left { {{x=-7} atop {y=9}} right.$
2)
$left { {{y+4x=2} atop {8x+3y=5}} right.$
$left { {{y=2-4x} atop {8x+3(2-4x)-5=0}} right. left { {{y=2-4x} atop {8x+6-12x-5=0}} right. left { {{y=2-4x} atop {1-4x=0}} right. left { {{y=2-4x} atop {x= frac{1}{4} }} right. left { {{y=2-4* frac{1}{4} } atop {x= frac{1}{4} }} right. left { {{y=1} atop {x= frac{1}{4}}} right.$

Answer 2

добавлено решение 2 системы,обновите страницу

Answer 3

спасибо)