Question

$3(x - y) = 6(y + 1) \ frac{x}{3} - 1 frac{1}{3} = y$

Answer 1

$begin{cases}3(x - y) = 6(y + 1)\ frac{x}{3} - 1 frac{1}{3} = yend{cases}$

$begin{cases}3x -3 y = 6y + 6\ frac{x}{3} - frac{4}{3} = y /cdot3end{cases}$

$begin{cases}3x -3 y -6y = 6\ x - 4 = 3yend{cases}$

$begin{cases}3x -9y = 6\ x -3y= 4 /cdot(-3)end{cases}$

$begin{cases}3x -9y = 6\ -3x+9y=-12end{cases}$

+______________

$0=-6$