運算式 15: "y" equals negative 2 thirds "x" plus 7 left brace, negative 3 less than or equal to "x" less than or equal to 0 , right bracey=−23x+7−3≤x≤0
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運算式 16: "y" equals 7 left brace, negative 2 less than or equal to "x" less than or equal to 0 , right bracey=7−2≤x≤0
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運算式 17: "y" equals negative 2 thirds "x" plus 5.6 6 6 left brace, negative 2 less than or equal to "x" less than or equal to 1 , right bracey=−23x+5.666−2≤x≤1
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運算式 18: "y" equals 5 left brace, negative 1 less than or equal to "x" less than or equal to 1 , right bracey=5−1≤x≤1
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運算式 19: "y" equals negative 2 thirds "x" plus 4.3 3 3 left brace, negative 1 less than or equal to "x" less than or equal to 2 , right bracey=−23x+4.333−1≤x≤2
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運算式 20: "y" equals 3 left brace, 0 less than or equal to "x" less than or equal to 2 , right bracey=30≤x≤2
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運算式 21: "x" equals negative 5 left brace, negative 2 less than or equal to "y" less than or equal to 1 , right bracex=−5−2≤y≤1
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運算式 22: "x" equals negative 3 left brace, negative 2 less than or equal to "y" less than or equal to 1 , right bracex=−3−2≤y≤1
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運算式 23: "y" equals negative 2 left brace, negative 5 less than or equal to "x" less than or equal to negative 3 , right bracey=−2−5≤x≤−3
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運算式 24: "y" equals negative 1 left brace, negative 10 less than or equal to "x" less than or equal to negative 8 , right bracey=−1−10≤x≤−8
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運算式 25: "x" equals negative 10 left brace, negative 1 less than or equal to "y" less than or equal to 1 half , right bracex=−10−1≤y≤12
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運算式 26: "y" equals 1 half left brace, negative 10 less than or equal to "x" less than or equal to negative 8 , right bracey=12−10≤x≤−8
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運算式 27: "x" equals negative 8 left brace, negative 1 less than or equal to "y" less than or equal to 1 half , right bracex=−8−1≤y≤12
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運算式 28: "y" equals 3 quarters "x" plus 6.5 left brace, negative 10 less than or equal to "x" less than or equal to negative 8 , right bracey=34x+6.5−10≤x≤−8
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運算式 29: "y" equals negative 3 quarters "x" minus 7.0 left brace, negative 10 less than or equal to "x" less than or equal to negative 8 , right bracey=−34x−7.0−10≤x≤−8
