Question

решите систему уравнений 3x-2у=14 2x+y=7

Answer 1

$left { {{3x-2y=14} atop {2x+y=7}} right. \ +left { {{3x-2y=14} atop {4x+2y=14}} right. \ left { {{3x+4x=14+14} atop {y=7-2x}} right. \ left { {{7x=28} atop {y=7-2x}} right. \ left { {{x=4} atop {y=-1}} right.$
Ответ: $(4;-1)$