Question

FAÇA A EQUAÇAO
X+Y=28
x²+Y²=56
com os calculos

Answer 1

Resposta:

x+y =28

x^2-y^2=56

x+y = 28

x = 28-y

x²-y² = 56

(28-y)²-y² = 56

784 -56y +y² -y²=56

-56y = 56 - 784

-56y = -728

y = 13

substituimos

x = 28-y

x = 28-13

x = 15