Question: Assign values in a sistem

This is what I ve to solve...It's simple!And it works, but if I write:

>fsolve({2*x + y = 1, x - y  = 2}, {x, y});

>y;

it writes y and to the value that solve the sistem!Did you understand?How can I do it?

 

>fsolve({2*x + y = 1, x - y  = 2}, {x, y});

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