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## Homework Statement

I am given 3 planes

1) (3-a)x-2y-4z=0

2)-2x-(2+a)y+6z=0

3) 4x+6y-(1+a)z=0

## The Attempt at a Solution

So what i did was i expanded the equation

1) 3x-xa-2y-4z=0

2)-2x-27-ya+6z=0

3)4x+6y-z+az=0

and i used the elimination method using

3x-xa-2y-4z=0

-2x-27-ya+6z=0

what i got was a= -10y+10z / 2x-3y

Now i do not know what to do next, i do not even know if i am doing this right can someone help

Thanks!!