Question

решите систему уравнений x-y=14,x^2-y^2=84

Answer 1

$left { {{x-y=14} atop {x^2-y^2=84}} right. left { {{x-y=14} atop {(x-y)(x+y)=84}} right. left { {{x-y=14} atop {14(x+y)=84}} right. left { {{x-y=14} atop {x+y=6}} right. 2x=20, x=10, y=-4$
Ответ: (10,-4)