Question

решите систему уравнений {x+y=10/{x^2-y^2=40

Answer 1

$left { {{x+y=10} atop {x^2-y^2=40}} right.;,,,,,,,,,left { {{x+y=10} atop {(x-y)(x+y)=40}} right.,,,,,,,left { {{x+y=10} atop {10(x-y)=40}} right.;,,,,,,,,left { {{x+y=10} atop {x-y=4}} right.$

Сложим уравнения 2x = 14

x = 7

y = 10 - x = 10 - 7 = 3

otvet: (7;3)