Question

х-у=1
х²-у²=7
решите систему уравнения

Answer 1

$left { {{x=1+y} atop {(1+y)^2-y^2=7}} right. \ left { {{x=1+y} atop {1+2y+y^2-y^2=7}} right. \ left { {{x=1+y} atop {2y=6}} right. \ left { {{x=1+y} atop {y=3}} right. \ left { {{x=4} atop {y=3}} right. \ (4;3)$