Which of the following equations is an example of a Mordell curve?
x2+y2=z2x^2 + y^2 = z^2x2+y2=z2
y2=x3+ky^2 = x^3 + ky2=x3+k
xn+yn=znx^n + y^n = z^nxn+yn=zn
ax+by=cax + by = cax+by=c