O: left parenthesis, StartFraction, left parenthesis, "a" plus "c" , right parenthesis Over 2 , EndFraction , StartFraction, left parenthesis, "b" plus "d" , right parenthesis Over 2 , EndFraction , right parenthesisa+c2,b+d2
Label:
equals=
left parenthesis, 0 , negative 2.5 , right parenthesis0,−2.5
8
Expression 9: left parenthesis, "y" minus "b" , right parenthesis left parenthesis, "c" minus "a" , right parenthesis equals left parenthesis, "x" minus "a" , right parenthesis left parenthesis, "d" minus "b" , right parenthesisy−bc−a=x−ad−b
9
Expression 10: left parenthesis, "x" minus "a" , right parenthesis squared plus left parenthesis, "y" minus "b" , right parenthesis squared equals left parenthesis, left parenthesis, "c" minus "a" , right parenthesis squared plus left parenthesis, "d" minus "b" , right parenthesis squared , right parenthesis times 0.7 5x−a2+y−b2=c−a2+d−b2·0.75
10
Expression 11: left parenthesis, "x" minus "c" , right parenthesis squared plus left parenthesis, "y" minus "d" , right parenthesis squared equals left parenthesis, left parenthesis, "c" minus "a" , right parenthesis squared plus left parenthesis, "d" minus "b" , right parenthesis squared , right parenthesis times 0.7 5x−c2+y−d2=c−a2+d−b2·0.75
11
Expression 12: left parenthesis, "y" minus StartFraction, left parenthesis, "b" plus "d" , right parenthesis Over 2 , EndFraction , right parenthesis left parenthesis, "d" minus "b" , right parenthesis equals negative left parenthesis, "x" minus StartFraction, left parenthesis, "a" plus "c" , right parenthesis Over 2 , EndFraction , right parenthesis left parenthesis, "c" minus "a" , right parenthesisy−b+d2d−b=−x−a+c2c−a