Question

решите систему уравнения 3х+5у=162х+3у=9

Answer 1

3х+5у=16
2х+3у=9

2*3х+2*5у=2*16
3*2х+3*3у=3*9

6х+10у=32
6х+9у=27

6х-6х+10у-9у=32-27
у=5

3х+5*5=16
3х+25=16
3х=16-25
3х=-9
х=-9/3
х=-3

3*(-3)+5*5=-9+25=16
2*(-3)+3*5=-6+15=9