In the following I expected the line $y=x$ in red for q; and the line
$y=-x$ in yellow for p. The plot for p is as desired, but the plot
for q contains also the line $y=-x$. This is using sage 4.6.1
#Is this a bug?
x,y=var('x y')
q=implicit_plot((x-y)/(x+y)==0,(x,-2,2),(y,-2,2),color='red')
p=implicit_plot((x+y)/(x-y)==0,(x,-2,2),(y,-2,2),color='yellow')
show(q)
show(p)
show(p+q)
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