如何用python绘制既平行于x轴又平行于z轴的平面？

import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')

import numpy as np
x = np.linspace(-10, 10, 100)
z = np.linspace(-10, 10, 100)

X, Z = np.meshgrid(x, z)

a = 1
b = 2
y = a * X + b

ax.plot_surface(X, y, Z, alpha=0.5)  # 绘制平面

ax.set_xlabel('X')
ax.set_ylabel('Y')
ax.set_zlabel('Z')

plt.show()