Expression 3: left parenthesis, "x" plus 2.8 9 7 , right parenthesis squared plus left parenthesis, "y" plus 1.5 2 8 , right parenthesis squared equals 4.6 9 3 squared left brace, "x" greater than 0.9 , right brace left brace, "y" greater than negative 1.5 2 8 , right bracex+2.8972+y+1.5282=4.6932x>0.9y>−1.528
3
Expression 4: "x" squared plus left parenthesis, "y" minus 0.5 8 2 , right parenthesis squared equals 1.2 3 left brace, "y" greater than 1.2 2 , right bracex2+y−0.5822=1.23y>1.22