Question

Решите систему уравнений: 3х-5у=7 -х+2у=-2 $left { {{3x-5y=7} atop {-x+2y=-2}} right.$

Answer 1

$left { {{3x-5y=7} atop {-x+2y=-2}} right. left { {{3x-5y=7} atop {x=2y+2}} right. left { {{3(2y+2)-5y=7} atop {x=2y+2}} right. left { {{y-1=0} atop {x=2y+2}} right. left { {{y=1} atop {x=4}} right.$