import matplotlib.pyplot as plt
from numpy import arange
from numpy import meshgrid
xs = arange(-13,13, 0.1)
ys = arange(-13,13, 0.1)
x, y = meshgrid(xs, ys)
eq1 = abs(abs(x)-5)+abs(abs(y)-5)-6
eq2 = x**2+y**2-16
eq3 = x**2+y**2-36
eq4 = x**6+y**6-1960000
plt.contour(x, y, eq1,[0])
plt.contour(x, y, eq2,[0])
plt.contour(x, y, eq3,[0])
plt.contour(x, y, eq4,[0])
plt.show()
