D: left parenthesis, 5 halves , 7 halves , right parenthesis52,72
Label:
equals=
left parenthesis, 2.5 , 3.5 , right parenthesis2.5,3.5
5
Expression 6: "x" squared plus "y" squared minus 5 "x" minus 2 "y" plus 1 equals 0x2+y2−5x−2y+1=0
6
Expression 7: left parenthesis, "x" squared plus "y" squared minus 5 "x" minus 2 "y" plus 1 , right parenthesis plus "k" left parenthesis, "x" minus "y" plus 1 , right parenthesis equals 0x2+y2−5x−2y+1+kx−y+1=0