import numpy as np
from matplotlib import pyplot as plt

plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

x = np.linspace(-5, 5, 100)
y = x ** 3

plt.text(0, 100, 'y=x^3', fontsize=22, bbox=dict(facecolor='red', alpha=0.5))
plt.plot(x, y, c='g')
plt.axis('off')

plt.show()