Question

найдите решение системы уравнений способом подстановки .
уравнения 2 и 4
номер 1499
Пожалуйста срочно

Answer 1

2)3x+5y=27
x+4y=23

x=23-4y

3*(23-4y)+5y=27
69-12y+5y=27
-7y=-42
y=6

x+4*6=23
x=-1

Answer 2

-42y-118+3y=11

Answer 3

-39y=11+118

Answer 4

......

Answer 5

129 не делится на 39

Answer 6

да,да я знаю поэтому не дописал его,какая то ошыбка

Answer 7

$left { {{3(x+2y)-y=27} atop {4(x+y)-3x=23}} right. left { {{3x+6y-y=27} atop {4x+4y-3x=23}} right. left { {{3x+5y=27} atop {x+4y=23}} right. left { {{3(23-4y)+5y=27} atop {x=23-4y}} right.$

$left { {{69-12y+5y=27} atop {x=23-4y}} right. left { {{69-7y=27} atop {x=23-4y}} right. left { {{-7y=-42} atop {x=23-4y}} right. left { {{y=6} atop {x=23-4*6}} right. left { {{y=6} atop {x=-1}} right.$



$left { {{2x+3(x+y)=11} atop {7(x+3y)-6x=-59}} right. left { {{2x+3x+3y=11} atop {7x+21y-6x=-59}} right. left { {{5x+3y=11} atop {x+21y=-59}} right. left { {{5(-59-21y)+3y=11} atop {x=-59-21y}} right.$

$left { {{-295-105y+3y=11} atop {x=-59-21y}} right. left { {{-102y=306} atop {x=-59-21y}} right.left { {{y=-3} atop {x=-59-21*(-3)}} right.left { {{y=-3} atop {x=-59+63}} right.left { {{y=-3} atop {x=4}} right.$