Question

resolva o sistema x+y=14. x=2y

Answer 1

$x + y = 14\\ x = 2y \\ \\ Substituir~x \\ \\ x + y = 14 \\ 2y + y = 14 \\ 3y = 14 \\ \boxed{y = \frac{14}{3}} \\ \\ x + \frac{14}{3} = 14 \\ \\ x = 14 - \frac{14}{3} \\ \boxed{x = \frac{28}{3}}$