Expression 56: 0.5 left parenthesis, "x" plus 5.1 , right parenthesis squared plus left parenthesis, "y" plus 1.1 , right parenthesis squared equals 1 left brace, negative 1 less than or equal to "y" , right brace left brace, negative 6.5 less than or equal to "x" less than or equal to negative 6 , right brace Has graph. To audio trace, press ALT+T.0.5x+5.12+y+1.12=1−1≤y−6.5≤x≤−6
56
Expression 57: 0.4 left parenthesis, "x" plus 5 , right parenthesis squared plus left parenthesis, "y" plus 0.8 , right parenthesis squared equals 1 left brace, negative 6.5 less than or equal to "x" less than or equal to negative 6 , right brace left brace, "y" greater than or equal to negative 0.9 , right brace Has graph. To audio trace, press ALT+T.0.4x+52+y+0.82=1−6.5≤x≤−6y≥−0.9
57
Expression 58: 0.5 left parenthesis, "x" plus 5 , right parenthesis squared plus left parenthesis, "y" plus 1.4 , right parenthesis squared equals 1 left brace, negative 1.2 less than or equal to "y" , right brace left brace, negative 6.3 5 less than or equal to "x" less than or equal to negative 6 , right brace Has graph. To audio trace, press ALT+T.0.5x+52+y+1.42=1−1.2≤y−6.35≤x≤−6