> with(plots):

Warning, the name changecoords has been redefined

> A:=implicitplot(y^2 = x^2*(x+1), x = -1.5..1.5, y = -4..4, numpoints=10000, thickness=2, color=blue):l1:=implicitplot(x+y, x = -1.5..1.5, y = -4..4):l2:=implicitplot(x-y, x = -1.5..1.5, y = -4..4):

> display(A, l1, l2);

>