Question

решить систему уравнений методом подстановки -x+2y=4 7x-3y=5

Answer 1

$left { {{-x+2y=4} atop {7x-3y=5}} right. left { {{x=2y-4} atop {7(2y-4)-3y=5}} right. left { {{x=2y-4} atop {14y-28-3y=5}} right. left { {{x=2y-4} atop {11y=33}} right. left { {{x=2y-4} atop {y=3}} right.$
$left { {{x=2*3-4} atop {y=3}} right. left { {{x=2} atop {y=3}} right.$