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The documentation for Sage plotting in 2 dimensions is here. From your description, I think you are talking about region_plot(). Here's an example:

x,y = var('x,y')
region_plot([x^2 + y < 1, x < y], (x,-2,2), (y,-2,2))

The region plotted consists of the points satisfying both equations (intersection).

The documentation for Sage plotting in 2 dimensions is here. From your description, I think you are talking about region_plot(). Here's an example:

x,y = var('x,y')
region_plot([x^2 + y < 1, x < y], (x,-2,2), (y,-2,2))

The region plotted consists of the points satisfying both equations (intersection).(intersection), where x is in the interval [-2,2] and y is in the interval [-2,2].

The documentation for Sage plotting in 2 dimensions is here. From your description, I think you are talking about region_plot(). Here's an example:

x,y = var('x,y')
region_plot([x^2 + y < 1, x < y], (x,-2,2), (y,-2,2))

The region plotted consists of the points satisfying both equations inequalities (intersection), where x is in the interval [-2,2] and y is in the interval [-2,2].