Question

Resolva:

x+y=40
x=9y
(sistema)

Answer 1

Resposta:

$x + y = 40 \\x = 9y \\ \\ 9y + y = 40 \\ 10y = 40 \\ y = \frac{40}{10} \\ y = 4 \\ \\ x + y = 40 \\ x + 4 = 40 \\ x = 40 - 4 \\ x = 36$