Enable text based alternatives for graph display and drawing entry

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Sketch a graph of `f(x) = {(x+7,"if",x le -2),(-4,"if",-2 lt x le 2),(0.5x-4,"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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