Question

Calcular el valor de x/y dell sistema:
x² -y² = 81
x + y = 27

Answer 1

x² - y² = 81
(27 - y)² - y² = 81
729 - 54y + y² - y² = 81
648 = 54y
12 = y

x + y = 27
x = 27 - y

x = 27 - 12
x = 15