Multiple choice question II — task. Mathematics State Board, Class 10.

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The solution of the system

$x + y - 3z = -6$ ,

$-7y + 7z = 7$ ,

$3z = 9$ is

$x = 1$ , $y = 3$ , $z = 2$
$x = 1$ , $y = 2$ , $z = 3$
$x = -1$ , $y = -2$ , $z = 3$
$x = -1$ , $y = 2$ , $z = 3$

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