Expression 4: "m" equals StartFraction, "f" left parenthesis, "b" , right parenthesis minus "f" left parenthesis, "a" , right parenthesis Over "b" minus "a" , EndFractionm=fb−fab−a
equals=
1.31.3
4
Expression 5: "y" minus "f" left parenthesis, "a" , right parenthesis equals "m" left parenthesis, "x" minus "a" , right parenthesisy−fa=mx−a
5
auxiliary points and lines
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left parenthesis, 4 , 1.6 , right parenthesis4,1.6
left parenthesis, 9 , 8.1 , right parenthesis9,8.1
left parenthesis, 9 , 1.6 , right parenthesis9,1.6