import numpy as np
import matplotlib.pyplot as plt

#mean = [0,0]
#cov = [[9,0],[0,1]]
mean = [0, 0]
cov = [[1,-0.75],[-0.75,1]]

x, y = np.random.multivariate_normal(mean, cov, 100).T
plt.plot(x, y, 'x')
plt.axis('equal')
plt.show()
