式12: left parenthesis, "x" plus "h" , right parenthesis squared plus left parenthesis, "y" minus "k" , right parenthesis squared equals "r" squaredx+h2+y−k2=r2
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式13: .2 "x" squared plus 0 "x" plus .7 5 "y" squared plus .1 "y" minus 9 equals 0.2x2+0x+.75y2+.1y−9=0
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式14: "p" equals 1p=1
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式15: "x" equals 2 left brace, 3.2 4 1 greater than "y" greater than .7 4 9 , right bracex=23.241>y>.749
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式16: "x" equals negative 2 left brace, 3.2 4 1 greater than "y" greater than .7 4 9 , right bracex=−23.241>y>.749
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式17: "y" equals 0 left brace, negative 6.7 1 less than "x" less than 6.7 1 , right bracey=0−6.71<x<6.71
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式18: StartFraction, "y" squared Over .1 "b" Superscript, 2 , Baseline , EndFraction minus StartFraction, "x" squared Over .1 "a" squared , EndFraction equals .2 5 left brace, 1 greater than "y" greater than 0 , right bracey2.1b2−x2.1a2=.251>y>0
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式19: "b" equals 1b=1
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式20: "a" equals 1a=1
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式21: "y" equals .1 5 "x" squared minus 3.2 5 left brace, negative 1.3 3 greater than "y" , right bracey=.15x2−3.25−1.33>y