Unable to solve simultaneous equations!

I tried solving the simultaneous equations in Matlab by writing the following commands:

>> syms a b
>> [a,b]=solve(a+b==1,2*a-b==4,a,b)

The following message was displayed:

Error using ==> char
Conversion to char from logical is not possible.

Error in ==> solve>getEqns at 169
   vc = char(v);

Error in ==> solve at 67
[eqns,vars] = getEqns(varargin{:});

Pla help me. Its urgent for my project eork.

Answer 1

[Walter Roberson]

Older versions of MATLAB cannot use == in a symbolic expression the way you show there.

Convert something of the form A == B into the form (A)-(B)

[Abin Krishnan]

Thank you so much.