Expression 21: 4 "a" left parenthesis, "y" minus 2 "b" , right parenthesis equals negative 4 "b" "x" left brace, 0 less than "x" less than 4 "a" , right brace4ay−2b=−4bx0<x<4a
21
Expression 22: 4 "a" left parenthesis, "y" minus 2 "b" , right parenthesis equals negative 4 "b" "x" left brace, 4 "a" less than "x" less than 0 , right brace4ay−2b=−4bx4a<x<0
22
Expression 23: 1 quarter left parenthesis, "x" , right parenthesis squared plus left parenthesis, "y" , right parenthesis squared equals 114x2+y2=1