Question

решительно систему уравнений

Answer 1

$left { {{2x+5y=-7} atop {3x-y=15}} right. left { {{2x+5y=-7} atop {15x-5y=75}} right. ; +; left { {{2x+5y=-7} atop {17x=68}} right. ; left { {{2x+5y=-7} atop {x=4}} right. ; left { {{5y=-7-8} atop {x=4}} right. ; left { {{y=-15} atop {x=4}} right.$