Expression 2: "f" Subscript, "r" , Baseline left parenthesis, "x" , right parenthesis equals 2 plus "x" Has graph. To audio trace, press ALT+T.frx=2+x
2
Expression 3: "f" Subscript, "l" , Baseline left parenthesis, "x" , right parenthesis less than or equal to "f" Subscript, "r" , Baseline left parenthesis, "x" , right parenthesis Has graph.flx≤frx