import matplotlib.pyplot as plt
from numpy import arange
from numpy import meshgrid
import numpy as np
np.seterr(divide='ignore', invalid='ignore')
xs = arange(-13,13, 0.1)
ys = arange(-13,13, 0.1)
x, y = meshgrid(xs, ys)
plt.figure(figsize=(12,12),dpi=80)
eq1 = abs(abs(x)-5)+abs(abs(y)-5)-6
eq2 = 4*x**2+9*y**2-400
eq3 = x**2-y**2-4
eq4 = x**6+y**6-1960000
plt.subplot(2,2,1)
plt.contour(x, y, eq1,[0],colors='red',linewidths=5)
plt.subplot(2,2,2)
plt.contour(x, y, eq2,[0],colors='blue',linewidths=5)
plt.subplot(2,2,3)
plt.contour(x, y, eq3,[0],colors='green',linewidths=5)
plt.subplot(2,2,4)
plt.contour(x, y, eq4,[0],colors='brown',linewidths=5)
plt.show()
