Question

ПОМОГИТЕ РЕШИТЬ СИСТЕМУ УРАВНЕНИЙ: 2х-3у=5 х+3у=7

Answer 1

2(7 - 3y) - 3y = 5

14 - 6y - 3y = 5

9y = 9

y = 1

x + 3 = 7

x = 4

Answer 2

$left { {{2x-3y=5} atop {x+3y=7}} right.$

 

$left { {{x=7-3y} atop {2x-3y=5}} right.$

 

$left { {{x=7-3y} atop {2(7-3y)-3y=5}} right.$

 

$left { {{x=7-3y} atop {14-6y-3y=5}} right.$

 

$left { {{x=7-3y} atop {-9y=-9}} right.$

 

$left { {{x=7-3y} atop {y=1}} right.$

 

$left { {{x=7-3} atop {y=1}} right.$

 

$left { {{x=4} atop {y=1}} right.$