import matplotlib.pyplot as plt
import numpy as np

x = np.linspace(-10, 10, 100)
y = -x + 4.5

plt.figure(figsize=(10, 6))
plt.plot(x, y, color='b', label='y=-x+4.5')
plt.xlabel('x')
plt.ylabel('y')
plt.title('График функции y = -x + 4.5')
plt.grid(True)
plt.legend()
plt.show()