In one variable
sage: x.subs(x==10)
works ok.
How to do a pair substitution ?
sage: var("x,y")
(x, y)
sage: (x,y).subs([x==10,y==20])
---------------------------------------------------------------------------
AttributeError: 'tuple' object has no attribute 'subs'
---------------------------------------------------------------------------
# Sage Version 6.2, Release Date: 2014-05-06 │
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