Expression 3: "y" Subscript, "F" , Baseline left parenthesis, "x" , right parenthesis equals 2 "y" Subscript, "f" , Baseline left parenthesis, "x" , right parenthesis minus "y" Subscript, "R" , Baseline left parenthesis, "x" , right parenthesisyFx=2yfx−yRx
3
Expression 4: "x" Subscript, "f" , Baseline left parenthesis, "y" , right parenthesis equals 5 halves plus 0 "y"xfy=52+0y
4
Expression 5: "y" Subscript, "S" , Baseline left parenthesis, "x" , right parenthesis equals "y" Subscript, "F" , Baseline left parenthesis, "x" minus 2.5 , right parenthesisySx=yFx−2.5
5
Expression 6: "y" equals negative "x" squared plus 5 "x" minus 1y=−x2+5x−1