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What about this?

var('y')
R = region_plot( abs(x) < 1 - abs(y) / 3, (x,-4,4), (y,-4,4), plot_points=300)
S = region_plot( abs(y) < 1 - abs(x) / 3, (x,-4,4), (y,-4,4), plot_points=300)
(R+S).show(aspect_ratio=1)