式21: "x" equals negative 75 plus 2 "y" left brace, negative 75 less than or equal to "x" less than or equal to negative 60 , right bracex=−75+2y−75≤x≤−60
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式22: "x" equals negative 25 minus 2 "y" left brace, negative 60 less than or equal to "x" less than or equal to negative 45 , right bracex=−25−2y−60≤x≤−45
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式23: "x" equals negative 55 plus .5 "y" left brace, negative 15 less than or equal to "y" less than or equal to 0 , right bracex=−55+.5y−15≤y≤0
23
式24: "x" equals negative 60 plus "y" left brace, negative 40 less than or equal to "x" less than or equal to negative 26 , right bracex=−60+y−40≤x≤−26
24
式25: "x" equals negative 45 minus .7 7 "y" left brace, negative 15 less than or equal to "y" less than or equal to 0 , right bracex=−45−.77y−15≤y≤0
25
式26: "x" equals negative 35 minus .2 "y" left brace, 30 less than or equal to "y" less than or equal to 48 , right bracex=−35−.2y30≤y≤48
26
式27: "x" equals negative 85 plus .7 "y" left brace, 8 less than or equal to "y" less than or equal to 23 , right bracex=−85+.7y8≤y≤23
27
式28: "x" equals negative 389 plus 8 "y" left brace, 45 less than or equal to "y" less than or equal to 47.5 , right bracex=−389+8y45≤y≤47.5
28
式29: "x" equals negative 82 minus .5 "y" left brace, negative 20 less than or equal to "y" less than or equal to negative 4 , right bracex=−82−.5y−20≤y≤−4
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式30: "x" equals negative 50 left brace, negative 25 less than or equal to "y" less than negative 8 , right bracex=−50−25≤y<−8
30
式31: "x" equals negative 40 plus "y" left brace, negative 32 less than or equal to "y" less than or equal to negative 20 , right bracex=−40+y−32≤y≤−20
31
式32: "x" equals negative 50 minus .5 "y" left brace, negative 33 less than or equal to "y" less than or equal to negative 18 , right bracex=−50−.5y−33≤y≤−18
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式33: "x" equals negative 55 left brace, 40 less than or equal to "y" less than or equal to 58 , right bracex=−5540≤y≤58
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式34: "x" equals negative 50 plus "y" left brace, 35 less than or equal to "y" less than or equal to 49 , right bracex=−50+y35≤y≤49
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式35: "x" equals 14 minus "y" left brace, 50 less than or equal to "y" less than or equal to 63 , right bracex=14−y50≤y≤63
35
式36: "x" equals negative 30 left brace, 55 less than or equal to "y" less than or equal to 74 , right bracex=−3055≤y≤74
36
式37: "x" equals negative 75 plus "y" left brace, 55 less than or equal to "y" less than or equal to 69 , right bracex=−75+y55≤y≤69
37
式38: "y" equals 76 left brace, negative 22 less than or equal to "x" less than or equal to negative 3 , right bracey=76−22≤x≤−3
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式39: "x" equals negative 60 plus .9 9 9 5 5 5 5 5 5 5 5 5 5 5 5 5 "y" left brace, negative 5 less than or equal to "x" less than or equal to 9 , right bracex=−60+.9995555555555555y−5≤x≤9
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式40: "x" equals negative 120 minus 2 "y" left brace, negative 60 less than or equal to "x" less than or equal to negative 45 , right bracex=−120−2y−60≤x≤−45
