On Feb 8, 10:09 am, tvn <[email protected]> wrote:
> I try to solve for y using the 2 simple equations x == 2*y , w==10   --
> basically I expect y = x/2  since the 2nd equation is irrelevant,  however
> it returns []  ?  

The second equation is not irrelevant. It just does not contain any
variables. And since w is not identical to 10, it makes the system
inconsistent. As far as the system is concerned, by declaring that
only y is a variable, the system looks similar to
[x==2*y, 1==0]

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