Question

решите систему уравнений {2х-3у=8, {х+у=9

Answer 1

$left { {{2x-3y=8} atop {x+y=9}} right.$

$left { {{2x-3y=8} atop {x=9-y}} right.$

$left { {{2(9-y)-3y=8} atop {x=9-y}} right.$

$left { {{18-5y=8} atop {x=9-y}} right.$

$left { {{-5y=-10} atop {x=9-y} right.$

y=2 ; x=7.