Enable text based alternatives for graph display and drawing entry

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Sketch a graph of:

`f(x) = {(-1.5x-4,"if",x le -4),(2,"if",-4 lt x le 4),(1.5x-6,"if",x gt 4):}`

12345678-1-2-3-4-5-6-7-812345678-1-2-3-4-5-6-7-8
Clear All Draw: LineLine segmentRayDotOpen dot

Note: Be sure to include closed or open dots, but only at breaks in the graph. Do not duplicate lines and points on the graph.

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