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ImplicitPlot errors


Hi,

I've been trying to get ImplicitPlot to plot an implicit function (naturally 
;) ), but it throws errors to cryptic for me, even when copying and pasting 
from the Mathematica function reference.

In[40]:= ImplicitPlot[{x^2 + x*y + y^2 == 7, y == 2*Sqrt[7/3]}, {x, -5, 5}]

ImplicitPlot::var :

Equation x^2+x 
Function[x,x^2+2xy-3y^2-16]+Function[x,x^2+2xy-3<<1>>-16]^2==7 does not have 
a single variable other than x

ImplicitPlot::var :

Equation Function[x,x^2+2xy-3y^2-16]==2Sqrt(7/3) does not have a single 
variable other than x

Out[40]:=\!\(ImplicitPlot[{x\^2 + x\ Function[x, x\^2 + 2\
          xy - 3\ y\^2 - 16] + Function[
              x, x\^2 + 2\ xy - 3\ y\^2 - 16]\^2 == 7, Function[x, x\^2 + 2\
              xy - 3\ y\^2 - 16] == 2\ \@\(7\/3\), x == 2\ \@\(7\/3\)}, {x, 
\
\(-5\), 5}, {Function[x, x\^2 + 2\ xy - 3\ y\^2 - 16], \(-5\), 5}]\)



What am I doing wrong? Even ImplicitPlot[x+y==2,{x,-4,4}] fails.

Thanks




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