Expresión 4: "m" equals StartFraction, left parenthesis, "f" left parenthesis, "a" plus "h" , right parenthesis minus "f" left parenthesis, "a" , right parenthesis , right parenthesis Over "h" , EndFractionm=fa+h−fah
4
Expresión 5: "y" equals "m" left parenthesis, "x" minus "a" , right parenthesis plus "f" left parenthesis, "a" , right parenthesisy=mx−a+fa
5
Expresión 6: left parenthesis, "a" , "f" left parenthesis, "a" , right parenthesis , right parenthesisa,fa
6
Expresión 7: left parenthesis, "a" plus "h" , "f" left parenthesis, "a" plus "h" , right parenthesis , right parenthesisa+h,fa+h