The parse error on the "x"

[Taban]

Hi everybody, 
I am a newby at Octave, I am trying to solve a one order differential equation. Thats my code:
function y = f (x,t) 
y = 5-2x; 
endfunction 
first = 2; 
t - linspace(0,20,100) 
s = lsode("f","first",t); 
plot(t,s,"r-")
And this is my error:
parse error near line 2 of file .../dif.m
  syntax error
>>> y = 5-2x; 
                                    ^

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