Question

$\frac{1}{x + y} = 6 \\ 2x + y = 0$

Answer 1

1/(x+y) = 6

2x + y = 0

1 = 6.(x + y)

1 = 6x + 6y

2x + y = 0

y = - 2x

6x + 6y = 1

6x + 6.(-2x) = 1

6x - 12x = 1

- 6x = 1 (-1)

6x = - 1

x = - 1/6

y = - 2x

y = - 2.(-1/6)

y = 2/6 (:2)/(:2)

y = 1/3