Question

Решите систему уравнений:
x^2-y^2=16
x+y=8

Answer 1

$left { {{x^2-y^2=16} atop {x+y=8}} right. textless = textgreater left { {{(x-y)*(x+y)=16} atop {x+y=8}} right. textless = textgreater left { {{(x-y)*8=16} atop {x+y=8}} right. textless = textgreater \ left { {{x-y=2} atop {x+y=8}} right. textless = textgreater left { {{x=2+y} atop {2+y+y=8}} right. textless = textgreater left { {{x=2+y} atop {2y=6}} right. textless = textgreater left { {{x=5} atop {y=3}} right.$