Enable text based alternatives for graph display and drawing entry

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Sketch a graph of `f(x) = {(x+4,"if",x le -1),(-5,"if",-1 lt x le 3),(-2x+5,"if",x gt 3):}`

Clear All Draw: LineLine segmentRayDotOpen dot

Note: Be sure to include closed or open dots, but only at breaks in the graph.

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