Expression 4: StartFraction, "x" squared Over 25 , EndFraction plus StartFraction, left parenthesis, "y" plus 7 , right parenthesis squared Over 4 , EndFraction equals 1x225+y+724=1
4
Expression 5: left parenthesis, "x" plus 3.5 , right parenthesis squared plus left parenthesis, "y" minus 2 , right parenthesis squared equals 7x+3.52+y−22=7
5
Expression 6: left parenthesis, "x" minus 3.5 , right parenthesis squared plus left parenthesis, "y" minus 2 , right parenthesis squared equals 7x−3.52+y−22=7