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Re: [newb] simple equation substitutions


On 11/1/2012 2:19 AM, Neal Becker wrote:
> {y == x + 2, x == 7}
>
> Solve[%, y]
>
> -> {}
>
> What I expected to happen is have x->7 applied to y == x+2.
>
> My real plan is to develop a list of (a lot more complicated)
>expressions that will have repeated substitutions applied.
>
> Why didn't the above work and/or what should I do instead?
>


Solve wants you to list _all_ the variables.

-----------------------
In[4]:= {y==x+2,x==7};
Solve[%,{y,x}]

Out[5]= {{y->9,x->7}}
------------------------

--Nasser



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