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Here is a minimal illustrating example:

sage: R = PolynomialRing(QQbar,'x,y')
sage: x, y = R.gens()
sage: I = R.ideal([x*x+y*y-1, x-5*y])
sage: I.variety()
[{y: -0.1961161351381841?, x: -0.9805806756909202?},
 {y: 0.1961161351381841?, x: 0.9805806756909202?}]