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find the values of $a$ and $b$ for which the following system is consistent

$x+ y-z+w=1$

$ax+y+z+w=b$

$3x+2y+aw=1+a$

Note: I have been using gauss elimination, but I got confused when completed "power-1" in the 3rd line

how to move in column 4?

I feel the value that can be entered is a $2$ and $a=1$, but I do not have proof for that

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    im sorry i mean i feel the value is a isn't 1 or 2... im sorry for my bad english2012-10-27
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    What do you mean by "power-1$?2012-10-27

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