Question

х+2у=550
5х+3у=1700
решение системы

Answer 1

х = 550 - 2y
5( 550 - 2y ) + 3y = 1700
2750 - 10y + 3y = 1700
- 7y = - 1050
y = 150
x = 550 - 300 = 250
Ответ ( 250 ; 150 )

Answer 2

Х=-2у+550
5(-2у+550)+3у=1700