Question

Решить систему уравнений х-у=11
                                               х²-у²=11

Answer 1

$left { {{x-y=11} atop {(x-y)(x+y)=11}} right. \left { {{x-y=11} atop {11(x+y)=11}} right. \left { {{x-y=11} atop {x+y=1}} right. \ left { {{x=11+y} atop {11+y+y=1}} right. \ left { {{x=11+y} atop {2y=-10}} right. \ left { {{y=-5} atop {x=11-5=6}} right. \ left { {{x=6} atop {y=-5}} right.$