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 []  ?   
If I try to solve for both y and x, the result is also [],  but if I try to 
solve for y and w, the result is as expected [[y == 1/2*x, w == 10]]  

sage: solve([x == 2*y,w==10],y)
[]
sage: solve([x == 2*y,w==10],y,w)
[[y == 1/2*x, w == 10]]
sage: solve([x == 2*y,w==10],y,x)
[]


There must be a reason behind this because I believe mathematica does the 
same too.    Is there a work around to achieve what I want ?  

Thanks,  

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