Mathematica program non-coordination between solve function and variable definition?

This is a discussion on Mathematica program non-coordination between solve function and variable definition? within the Tech Board forums, part of the Community Boards category; i wrote a program in which we need to find the values of two variables a and b and then ...

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    Mathematica program non-coordination between solve function and variable definition?

    i wrote a program in which we need to find the values of two variables a and b and then give their sum.But, when i do a+b, it tells
    In[60]:= a + b

    Out[60]= a + b

    what is the problem?

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    and the hat of wrongness Salem's Avatar
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    Without more code, we canīt say - because we canīt see your screen.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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    Code:
    In[55]:= Solve[{2 a + 3 b == 9, a - 23 b == 16}, {a, b}]
    
    Out[55]= {{a -> 255/49, b -> -(23/49)}}
    
    In[56]:= a + b
    
    Out[56]= a + b
    Last edited by suryap.kv1bbsr; 10-09-2010 at 03:17 AM. Reason: this was the code

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    Registered User carrotcake1029's Avatar
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    Looks OK to me. I even plugged it into wolframalpha.com, which is there kind of free to the public calculator that supports mathematica syntax.
    Code:
    http://www.wolframalpha.com/input/?i=Solve[{2+a+%2B+3+b+%3D%3D+9%2C+a+-+23+b+%3D%3D+16}%2C+{a%2C+b}]
    *had to use code tags because bbcode engine thought this was code...

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    Quote Originally Posted by carrotcake1029 View Post
    Looks OK to me. I even plugged it into wolframalpha.com, which is there kind of free to the public calculator that supports mathematica syntax.
    Code:
    http://www.wolframalpha.com/input/?i=Solve[{2+a+%2B+3+b+%3D%3D+9%2C+a+-+23+b+%3D%3D+16}%2C+{a%2C+b}]
    *had to use code tags because bbcode engine thought this was code...
    this is only value of a nd b
    now i want to automatically deduce a+b, which is not working becoz it does not consider the values derived from the equations as values of a and b

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