Question

$left { {{4x-y=9} atop {3x+7y+=-1}} right.$

Решите систему уравнений,прошу ))

Answer 1

$left { {{4x-y=9} atop {3x+7y=-1}} right. \ left { {{y=4x-9} atop {3x+7(4x-9)=-1}} right. \ left { {{y=4x=9} atop {3x+28x-63=-1}} right. \ left { {{y=4x-9} atop {31x=62}} right. \ left { {{y=4*2-9} atop {x=2}} right. \ left { {{y=-1} atop {x=2}} right.$