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The relation x^2 + y^2 = 1 is not an expression of y as a function of x.

To plot the graph of such a relation, Sage has a dedicated method.

It is called implicit_plot.

Try this:

sage: x, y = SR.var('x, y')
sage: implicit_plot(x^2 + y^2 == 1, (x, -5, 5), (y, -5, 5))

The relation x^2 + y^2 = 1 is not an expression of y as a function of x.

To plot the graph of such a relation, Sage has a dedicated method.

It is called implicit_plot.

Try this:

sage: x, y = SR.var('x, y')
sage: implicit_plot(x^2 + y^2 == 1, (x, -5, 5), (y, -5, 5))

For the various types of 2D plots available in Sage, see: