Enable text based alternatives for graph display and drawing entry

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Sketch a graph of `f(x) = {(0.5x+5,"if",x le -4),(6,"if",-4 lt x le 2),(-1.5x+7,"if",x gt 2):}`

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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