如何在plot中绘制隐式方程？

import numpy as np
import matplotlib.pyplot as plt
from sympy import symbols, Eq, solve

x, y = symbols('x y')

equation = Eq(x**2 + y**2, 1)

solutions = solve(equation, y)

f = np.vectorize(lambda i: solutions[0].evalf(subs={x: i}))

x_vals = np.linspace(-1, 1, 1000)
y_vals = f(x_vals)

plt.plot(x_vals, y_vals)
plt.xlabel('x')
plt.ylabel('y')
plt.title('Plot of Implicit Equation')
plt.grid(True)
plt.show()