表达式17: "y" equals "x" plus 9 left brace, negative 6 less than or equal to "x" less than or equal to negative 4 , right bracey=x+9−6≤x≤−4
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表达式18: "y" equals negative "x" minus 1 left brace, 1 less than or equal to "x" less than or equal to 4 , right bracey=−x−11≤x≤4
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表达式19: "y" equals "x" minus 1 left brace, negative 4 less than or equal to "x" less than or equal to negative 1 , right bracey=x−1−4≤x≤−1
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表达式20: "y" equals "x" minus 9 left brace, 4 less than or equal to "x" less than or equal to 6 , right bracey=x−94≤x≤6
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表达式21: "y" equals negative "x" minus 9 left brace, negative 6 less than or equal to "x" less than or equal to negative 4 , right bracey=−x−9−6≤x≤−4
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表达式22: "x" equals negative 4 left brace, 2 less than or equal to "y" less than or equal to 3 , right bracex=−42≤y≤3
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表达式23: "x" equals negative 3 left brace, 2 less than or equal to "y" less than or equal to 3 , right bracex=−32≤y≤3
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表达式24: "y" equals 2 left brace, 3 less than or equal to "x" less than or equal to 4 , right bracey=23≤x≤4
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表达式25: "x" equals 4 left brace, 2 less than or equal to "y" less than or equal to 3 , right bracex=42≤y≤3
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表达式26: "y" equals negative "x" plus 2.5 left brace, negative 2 less than or equal to "x" less than or equal to negative .5 , right bracey=−x+2.5−2≤x≤−.5
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表达式27: "x" equals negative 4 left brace, negative 3 less than or equal to "y" less than or equal to negative 2 , right bracex=−4−3≤y≤−2
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表达式28: "x" equals negative 3 left brace, negative 3 less than or equal to "y" less than or equal to negative 2 , right bracex=−3−3≤y≤−2
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表达式29: "y" equals negative 3 left brace, negative 4 less than or equal to "x" less than or equal to negative 3 , right bracey=−3−4≤x≤−3
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表达式30: "y" equals negative 2 left brace, negative 4 less than or equal to "x" less than or equal to negative 3 , right bracey=−2−4≤x≤−3
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表达式31: "x" equals 4 left brace, negative 3 less than or equal to "y" less than or equal to negative 2 , right bracex=4−3≤y≤−2
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表达式32: "x" equals 3 left brace, negative 3 less than or equal to "y" less than or equal to negative 2 , right bracex=3−3≤y≤−2
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表达式33: "y" equals negative 3 left brace, 3 less than or equal to "x" less than or equal to 4 , right bracey=−33≤x≤4
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表达式34: "y" equals negative 2 left brace, 3 less than or equal to "x" less than or equal to 4 , right bracey=−23≤x≤4
