Expression 4: "f" Subscript, 2 , Baseline left parenthesis, "x" , "y" , right parenthesis left brace, "y" equals "b" , right bracef2x,yy=b
4
Expression 5: "a" equals negative 3a=−3
negative 5−5
55
5
Expression 6: "f" Subscript, 1 , Baseline left parenthesis, "a" , "b" , right parenthesis tilde "f" Subscript, 2 , Baseline left parenthesis, "a" , "b" , right parenthesisf1a,b~f2a,b
6
Expression 7: "f" Subscript, 1 , Baseline left parenthesis, "a" , "y" , right parenthesis plus "f" Subscript, 2 , Baseline left parenthesis, "x" , "b" , right parenthesis minus "f" Subscript, 1 , Baseline left parenthesis, "a" , "b" , right parenthesisf1a,y+f2x,b−f1a,b
