Expression 2: "y" equals left brace, 1000 greater than or equal to "x" greater than or equal to 500 : "x" minus 1 , right brace Has graph. To audio trace, press ALT+T.y=1000≥x≥500:x−1
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Expression 3: "x" equals left brace, "y" less than or equal to 1000 : "y" , right brace Has graph. To audio trace, press ALT+T.x=y≤1000:y