I have posted before about it but no one responded, 
https://groups.google.com/forum/#!topic/sage-support/Hw74ZEIxGfw

On Friday, July 27, 2012 8:56:12 AM UTC-7, kcrisman wrote:
>
>
>
> On Friday, July 27, 2012 11:24:03 AM UTC-4, Eric Kangas wrote:
>>
>>
>> I have a symbolic equation that needs to be plotted. example: y |--> x^2 
>> + x + 1. How do I transform it into y = x^2 + x + 1 so I can be able to 
>> make a plot?
>>
>
> Can you be more specific with what doesn't work? This works fine.
>
> y = x^2+x+1
> plot(y,-5,5)
>
> So does this
>
> y(x) = x^2+x+1
> plot(y,-5,5)
>
> and this
>
> y == x^2+x+1
> plot(y,-5,5) 
>

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